Suggest Ways To Determine The Date Of Conception Of A Fetus

Posted on Sun, 18 Sep 2016

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Sun, 18 Sep 2016 Answered on

Wed, 12 Oct 2016 Last reviewed on

Question : This issue is for an OBGYN. My problem is my fiance is pregnant which isnt the problem, but i found out she cheated on me and its close to the time the baby would of been concieved from my calculations. Her LMP was 2/27/16 and she cheated on me 3/2/16. Her first ultrasound was 5/5/16 and it put the GA of the baby at 9wks3days. Also the CRL was 26.96mm. From everything i have read amd have been told, there is no possible way the baby could be the other guys. I have been told that on average the first 8-10 days from the start of a menstral cycle are considered "safe days" and chance of getting pregnant are slim to none. My only concern is that her period is sometimes irregular. Some months its right on and some months its a little later than normal, this has caused us to think she was pregamt in the past. But there have been times where it will come early. When it does come early its rare. i think only a few times since we have been together. Please help

Answered by Dr. Dr. Rakhi Tayal (57 minutes later)

Brief Answer:
Conception happened around 14th March.

Detailed Answer:
Hello,
Thanks for trusting us with your health concern.
Her ultrasound on 5th May suggested a gestational age of 9 weeks 3 days. It means the approximate date of conception was around 14th March. According to her LMP the ovulation should have happened around 12th March. Her conception was not near 2nd Feb. So most likely the child is yours.
Please feel free to discuss further. I will be glad to answer the follow up queries that you have.
Wishing you good health.
Regards.
Dr. Rakhi Tayal.
For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Rakhi-Tayal

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Dr. Rakhi Tayal (59 minutes later)

when you say conception was not near 2nd feb was that a typo and meant to say march

Answered by Dr. Dr. Rakhi Tayal (7 hours later)

Brief Answer:
It was a typing mistake.

Detailed Answer:
It was a typing mistake. I meant to say that the conception was not near 2nd March.
Regards.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Dr. Rakhi Tayal (10 minutes later)

How long does sperm live on average. i have been told 24 hours is the best for conception and after 3 days most of them are dead. So my chances are pretty high that shes my daughter

Answered by Dr. Dr. Rakhi Tayal (6 minutes later)

Brief Answer:
Sperm lives for 3 days.

Detailed Answer:
A sperm cannot live for more than 3 days and there is no chance that it can cause conception on 14th March if the sex happened on 2nd march. So she is your daughter only.
Regards.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Dr. Rakhi Tayal (12 hours later)

awesome thank you so much

Answered by Dr. Dr. Rakhi Tayal (3 hours later)

Brief Answer:
You are welcome.

Detailed Answer:
Hello.
Thank you.
I am happy I could help.
Please do recommend our services to others too in case you found them helpful. For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Rakhi-Tayal
Wishing you the best in whatever you do.
Best regards.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Dr. Rakhi Tayal (24 hours later)

I will recommend your service to others as it has beem a great help to me and my soon to be family, and has put my mind at ease. grom speaking with you i now feel that it was a bad concidence amd that my daughter is biologically mine. i know i could confirm with a paternity test but afyer speaking to you i feel that it would be a waste of time and money. Again thank you for your time

Answered by Dr. Dr. Rakhi Tayal (6 hours later)

Brief Answer:
You are welcome.

Detailed Answer:
Thanks for trusting us.
Best wishes.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar