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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.

Ouch! The One Pregnancy Symptom You Must Know About

Pregnancy Week 4 Comfort Meter

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Showing 1 - 10 out of 100 Comments
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anthony Mar 1, 2015 12:05:12 PM ET

Is it safe to have sex with a woman that is 3 weeks pregnant?

Guest Mar 22, 2015 02:52:14 PM ET

It's safe to have sex with a pregnant woman, as long as it's comfortable no matter the week she's at. at 3 weeks, people don't usually know yet, and shouldn't notice any difference.

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Tender nipples Feb 24, 2015 05:57:17 PM ET

My period was 5 days late, but on feb 5th, i had somewhat of a period. it was 4 days long and somewhat light. now, two weeks later, i have had tender nipples for almost a week with lower back pain.

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Guest Feb 13, 2015 07:24:07 PM ET

I had sex (unprotected) in january, and it's now feb 13. i've noticed my stomach looks a bit bigger. i've been a bit constipated, and have had a few headaches. i'm also a bit emotional. i'm really scared that i might be pregnant, and need some advice! :(

Guest Apr 11, 2015 10:35:36 AM ET

Take a home pregnancy test to see if you're pregnant. be sure to check any medications that maybe dangerous to take. seek an obgyn as soon as you can. most symptoms occur the first 8 weeks. but sometimes you can feel them as early as 5 weeks.

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Jordan Feb 5, 2015 06:24:41 PM ET

I don't remember the last time i had my period, but i know that it was in december. my boyfriend and i are very sexually active, and he doesn't pull out ever. just a couple days ago, i started getting headaches and period like cramps. i've been getting really moody. i didn't have my period at all last month, and i'm scared that i'm pregnant. so could i be?

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Louise Jan 27, 2015 02:39:04 PM ET

Hey... i had unprotected sex twice 8 or 9 days ago. since then, i've had cramps in my stomach, and a sore back. i also had cramps in my legs. this morning, i woke up with a creamy discharge there, and there was quite a lot of it!. so, i took a pregnancy test, and it was negative. i'm not due for my period for about a week and a half. shall i wait until then? if it's late, should i take one again? i also have a doctor's appointment next wednesday! even though i have a negative result, is there a chance i could be still pregnant?

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magi Dec 28, 2014 03:34:04 AM ET

Well, i'm 20 days late on my period so here is my story. i was pregnant and lost it at weeks. then, i got the depo shot after the 3 months were over. i didn't get it because i wanted my period, so i waited and 2 month passed. then, my period never came and the doctors started me on the pill. can i still be pregnant even though i'm on the pill? by the way, all tests were negative. i just need advice. i'm scared.

magi Jan 8, 2015 03:44:10 AM ET

Well now i'm 28 days late and still have a negative test. but, today, i had some light pink discharge (sorry tmi) in the morning and evening, and some cramping, but nothing now. can anyone help me out?! i'm going to make an appointment hopefully in 2 weeks just to see what happens.

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kenyell Dec 11, 2014 01:12:40 AM ET

My boyfriend is fixed so we have unprotected sex all the time now. i am starting to feel sick. am i pregnant?

magi Dec 28, 2014 03:38:01 AM ET

Well, it's better to have a pregnant test done. if you still not sure ask your doctor for a blood test.

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Rebecca Beverly Nov 18, 2014 02:50:34 AM ET

Hello. i am currently 4 weeks pregnant, and experiencing fatigue, headaches, and cramps. for how long will it continue? i am feeling worn out. what foods should i be eating to have a healthy pregnancy? can i still indulge in sex with my partner? kindly help, and assist a sister.

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Betsy Sep 22, 2014 12:19:24 AM ET

Not last week, but the week before i had some brownish lite pink discharge, and i thought it was just a weird period. this lasted for about 5 days and stopped. i just can't figure out what it was. about two weeks after that i started feeling sick to my stomach, bad headaches, using the bathroom a lot, and my breasts are a little tender, but not too much. i took a pregnancy test today, and it was negative i'm just totally stumped here.

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Guest Jul 23, 2014 08:46:42 PM ET

I've had unprotected sex 5 times this month. i've taken 3 plan b pills. usually i'm on bc pills but not this month. i got a one-day long period from one plan b pill and another one-day long period from the second plan b pill. but, i didn't take the third pill until day 3 after unprotected sex. i never got a period from it. then 3 days ago (two weeks after the last unprotected sex) i had a light period for two days. my head hurts, i'm nauseous, my back hurts, i'm more bloated than i've ever been, i'm moody, slept for 13 hours the other day, and discharged some milky stuff. but all epts are negative. my period should be this coming week, maybe? i'm unsure. i'd really love to have a baby but it's not something i'm ready to try for. could i already have a little zygote inside me?

Guest Sep 19, 2014 04:46:14 PM ET

Hi there. whenever i have taken the plan b pill, it always gives me outrageous pregnancy symptoms. it is because of the hormones in it. so, if you're not pregnant, that could be what it is. :-)

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