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You are here: Home > Pregnancy > Pregnancy Week by Week > Week 4

Pregnancy Week 4

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Fetal Development Images - Pregnancy  4
Week 4 fetal development image showing the fetal growth of your baby to date. Medical Illustration Copyright © 2008 Nucleus Medical Art, All rights reserved

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Baby Development

Roughly the size of a poppy seed, your baby is now entering the phase of development known as the embryonic period. The cluster of cells that is becoming baby has traveled down the fallopian tubes and have settled into the uterus, where the next big task is to divide in half. One half of the cells become the placenta while the other half becomes baby. The baby cells divide further, into three groups.

The first, the inner layer, is called the endoderm. The endoderm develops into the digestive system, liver, lungs, pancreas and thyroid. The middle layer, or mesoderm, becomes heart, reproductive organs, bones, kidneys and muscles. The outer layer, or ectoderm, becomes brain, spine, nerves, skin, hair, eyes, teeth, sweat and mammary glands. The amniotic sac and yolk sac are forming now as well. The yolk sac eventually will become part of the digestive system.

Pregnancy Symptoms

Sounds a lot like PMS, doesn't it? Early pregnancy symptoms are quite similar to premenstrual syndrome. You might feel more breast tenderness than you usually would with your period however, and your breasts might be enlarged somewhat. You may feel some abdominal pressure and might experience implantation bleeding. This is spotting, and may be light pink, red or brown. It happens when the embryo implants itself into the uterine wall. It's not rare, but certainly not unexpected either. Whether you have spotting or not, you need not worry.

Visit With the Obstetrician

Usually you won't be seeing a physician for your pregnancy until your 8th week or so. However, you will be taking a home pregnancy test at this point most likely. If it is negative, wait a week and retest. Sometimes the pregnancy hormone, hCG, is still too faint at 4 weeks for many tests to pick them up. You can begin looking for a doctor or health care provider, and might interview the most promising prospects to see if you have a good match in expectations.

Preparing for Baby

This is a great time to just start reading up on early pregnancy.

Pregnancy Lifestyle

Check that medicine cabinet. Are there prescriptions drugs you take regularly? If so, read up on them or talk to your pharmacist about the safety of taking them while pregnant. If you find out a drug you take can be dangerous in pregnancy, talk to the prescribing physician immediately. Don't wait until your prenatal visits begin. Also, check on any over the counter medications to see if they are safe to take while pregnant.

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Comments

Showing 1 - 10 out of 89 Comments
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Guest Apr 15, 2014 07:06:36 PM ET

I have been having unprotected sex with my boyfriend for about a month now. we had sex around my ovulation days also. one day i woke up and my breast was bigger and my nipples were sore. i don't know why but i can't lay on my stomach. i have been eating an awful lot and i feel tired all through the day. i've also had diarrhea a lot and i'm peeing more than usual. i used to can hold my pee from the time i wake up to the time i went to sleep but now if i have to pee i can't hold it for nothing. i won't even be able to go so i sleep. i'm not suppose to have my period until next week on wednesday but i took a pregnancy text yesterday and it came back negative. i know that there's a good chance i could be pregnant but i also feel like my body is doing this to me. i want to be pregnant so bad and i think i am. help!

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Help! Jan 27, 2014 09:53:14 AM ET

I'm currently 3 and a half weeks late. i've been pregnant before but lost it unfortunately. i don't know when my symptoms started last time as i was sick around the time i fell pregnant, i've taken 4 pregnancy tests now, one at the doctors and all negative, i have been an emotional wreck lately, and cannot stop crying over absolutely nothing! i feel sick when i think about eating but am okay when i eat, i am just so confused and hoping that there is a bubba inside of me :(

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BrittBratt Oct 23, 2013 12:23:02 PM ET

I have a six year old and me and my fiance have been having sex for 2yrs and no baby he has no children of his own so he started thinkn he could not jst so last month we really started trying and i woke up just feeling really different last week my breasts are not as sore but noticeably large im cramping with no bleeding and very gassy with diarreah also moderatley tired my period usually comes on time and normally my body signals me thats its coming and i just dont feel that way i took 3 hpt last week all neg. should i jst wait another week when my period is really late it was due yesterday

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I was wondering if I may be pregnant? Oct 6, 2013 12:18:20 AM ET

September 29, 2013 and still have not started. my last period was august 27, 2013 and the are regular. i calculated and i may have conceived between sept 6-13 if so if i take an at home test should it show up a positive? this will be my first pregnancy so i don't really know what to expect with these test.

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Grace Sep 4, 2013 02:13:30 PM ET

I had light bleeding which lasted 2 days, not even enough to wear a pad. my period isnt due till this coming week, well 2 days. my last period was aug 5, 2013. i took a pregnancy test today and it came out negative, thinking of getting a better one,i just picked up a cheap one at the dollar store. so when could i go and get tested? should i wait another week?

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Ali Jun 19, 2013 09:01:57 PM ET

I had my period last month and it was brownish and me my boyfriend and i had unprotected sex and he did not "pull out" and i didn't take my pill for like 3 days prier to that, and i've noticed that i have to pee a lot lately and it's like i need to pee now or ill pee my pants i also get sick in the mornings a lot, like the smell of food anything makes me sick, i have to go to the doctors tomorrow to change my birth control i think their going to give me a pregnant test but i'm not sure.. what do you guys think???

me Jul 22, 2013 07:58:06 AM ET

I think you could be pregnant and should take a test because bc can harm your baby if you keep taking it.

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Ladyblue Jun 19, 2013 02:19:39 AM ET

I was 3days late when i took a ept test which came back a faint positive.. 2days later went to the doc and had a urine test done which also came back positive.. they say it was too early, but i'm pregnant.. every female is different. i'm 4wks with heartburn,headaches and hiccups here and there

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Love3012 Mar 26, 2013 07:21:36 PM ET

I have the symptom , but i did the test, it negative, i so confuse. so i'm still waiting.

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cindy Mar 9, 2013 01:20:43 PM ET

Hi im 4 weeks late..ive never been pregnant and ive been trying for 8 yrs now..so this is new to me...i never missed a period..i took 2 hpt n its negative took another 1 at my gyno said neg also..took blood work but still waiting on the results for it..but i know its too early to tell if im prego..i really hope i am

Myra, RN Mar 12, 2013 10:48:32 PM ET

Was it positive ? im a rn but when one wants something badly, they start to feel symptoms (and thats me).

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Unknown.. Feb 2, 2013 03:25:31 PM ET

I had stopped my birthcontrol in decemember 2012 bc i was dropped from medicaid. had period in december which i thought it was supposed to come not the last tuesday but the one before and it didnt. it finally came like a week late. januarys period has never came. i thought it was my birthcontrol so i havent worried about it. well took 6 pregnancy test in the last 3 days and 3 brands. all have faint lines saying im positive. i think i dont want to believe it but what do you think. you think im pregnant bc im starting to.. i have a 2 1/2 year old and i just knew i was pregnant with him before i could find out. this is different but im thinking i am pregnant... what would you suspect?

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