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Implantation of a Fertilized Egg

Teresa Shaw


When trying to conceive, it's sometimes hard not to scrutinize every sign and symptom you feel for possible signs of pregnancy. One of the most tell tale signs of pregnancy for many women is implantation, or when a fertilized egg, or zygote, implants into the lining of the uterus. Many women ask when does implantation occur, and what are the signs of implantation?

When Does Implantation Occur?

Implantation typically occurs 6 to 10 days after ovulation, or day 20 to 24 of a menstrual cycle. However, it can happen a few days earlier or later. In an average 28-day cycle, ovulation occurs on day 14 with the first day of a woman's period being considered day 1 in a cycle. Once fertilization occurs, the egg stays in the fallopian tube for three days before entering the uterus and begins to implant itself to the uterine lining.

Find out when implantation will happen based on your last menstrual period or ovulation date with our implantation calculator.

What is Implantation?

Implantation happens when a fertilized egg attaches itself to the uterine wall. Once fertilization occurs, the fertilized egg remains in the fallopian tube for 3 days. It then enters the uterus where it gets very close to the lining of the uterus (endometrium) and begins to invade this endometrium to implant.

What are the Signs and Symptoms of Implantation?

Implantation is usually a quite gentle process with very few symptoms that can be felt or noticed. Most symptoms are usually detected or diagnosed as implantation once pregnancy has been confirmed; that is, once you realize you're pregnant, certain symptoms you might have noticed a few days prior will match up to those common to implantation.

The following are some typical signs of implantation.

  • Implantation Cramps - Some women report having small uterine cramps around the time of implantation.
  • Implantation Spotting or Bleeding - A very small amount of spotting or implantation bleeding may occur for a short period of time, around 7 to 10 days after ovulation has taken place.
  • Basal Body Temperature Rise - If you are tracking your basal body temperature daily, you may notice a second thermal shift (rise in temperature) that occurs about 7 to 10 days past the date that ovulation has been confirmed.
  • Implantation Temperature Dip - When charting, you may also notice a temperature dip that lasts for a single day, usually around 7 to 10 days past ovulation.

Only a positive pregnancy test or a blood test performed by your doctor can confirm that you are pregnant. Don't despair if you haven't felt or noticed any of these signs of implantation. Very few women actually notice implantation, and not feeling implantation does not mean that you are not pregnant. If you think you might be pregnant, be sure to make an appointment with your doctor to confirm a pregnancy.


Implantation calculator - Find out when implantation will occur if you conceived

Calculate your approximate ovulation date with our ovulation calculator

Do you think you might be pregnant? Find out your due date with our due date calculator.

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Does ovulation only happen on Day 14?


Showing 1 - 10 out of 353 Comments
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edith omondi Dec 14, 2017 04:48:59 PM ET

I ovulated on 8th of this month and had sex 9th of this month. Will I really get pregnant, because I desperately want a child after I lost baby ?

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Crystal Apr 18, 2017 02:25:01 AM ET

I have been off the shot for bit, but I had light spotting today and it stopped. What's wrong? I have not had a period for 2 months.

iLona May 12, 2017 12:42:53 AM ET

When i went off the pill i didn't get my period for a year. turns out my prolactin levels were high which caused my body to think it was already pregnant . after going to the doctor i was given bromocriptin and a couple months later i got my .period

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Jess Jan 22, 2017 06:12:35 PM ET

I'm trying to work out if it's implantation or my period. I didn't have any pain to start with but a few days ago my boobs were sore and today is 17 days after my ovulation day. The thing is I was 4 days late. I took a test and it came back negative but last night I started with a little red blood and the small cramps are getting a little more sore and I got that much of a dizzy spell I felt like I was going to throw up. My period cramps are usually so bad I need to take a few nurofen and a heat pack. Please help. I really need to know. Going to see a doctor tomorrow.

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Mamum Jan 21, 2017 11:27:46 PM ET

Hi all, I had sex on the 31st of December, Wednesday the 18th. I had bleeding, quite light. It got a tiny bit heavier on the 19th and was gone on the 20th. I also had diarrhea on the 20th and today being the 21st, could I be pregnant?

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busi Jan 10, 2017 11:34:06 AM ET

Hi.I've done TAH and now my husband wants a baby. what can I do?

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Pinky sharma Dec 9, 2016 07:33:19 AM ET

Date of my last period was 8nov.I'm expecting to b pregnant this month.But I had leg cramps, abdomen cramps, back ache on Nov 30 along with slight bleeding..I'm continuing to have these cramps.But yesterday i.e on 8thdec I had slight bleeding.I was pretty sure that I had gotten my period.But after that I'm having no bleeding though I'm having leg cramps and back ache..vl I get my period.

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Dee Nov 4, 2016 01:01:09 PM ET

Me and my partner had unprotected sex September 19th, 2016 and my period is due On the 11th of this month but, I started bleeding 2 days ago but, it wasn't heavy. My back is killing me , I had a headache yesterday, the left side of my stomach hurts but not as bad. Could I be pregnant? I'm new to this all.

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Eve-e Sep 28, 2016 11:13:09 PM ET

I had my period on the 10th of September 2016. Started clomid 10g on the second day Had sex from 21st to 25th of the same month as being my expected fertile days. Now I'm having cramps and passing a lot of gas. I'm really being optimistic about getting pregnant after loosing two babies. Please, I need your prayers all. Will have to wait for hcg to build up before testing.

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Claire Aug 14, 2016 06:41:56 AM ET

I had ovulation pains on the 11th August (day 11 of my cycle). I inseminated on days 13/14/15. Could this work?

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Guest Apr 13, 2015 08:59:36 AM ET

I started my period on March 6. What day would implantation begin?

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