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How To Determine The Date Of Conception?

Posted on Thu, 19 Jan 2017

Question: Hello I recently had a baby on November 30th, I am trying to find out when I most likely concieved. I didn't know I was pregnant until I was 17 weeks and 4 days due to bleeding towards the end of March and no symptoms.
My first ultrasound on XXXXXXX 23rd put me as being due Nov 27th. I later had another US for an anatomy scan on July 19th and measured behind 2 days.
Throughout I measured behind with both fundal checks and through ultrasounds.
My last ultrasound was at 38 weeks 2days where they told me the baby measured 6lb 4oz
The baby was born 2 weeks and a day later at just 6lb 2ounces and 19 inches long
I had sex on Feb 20th, 25th, March 5th and 11th.

Answered by Dr. Vjollce Mbiarra (50 minutes later)

Brief Answer:
Probably during March

Detailed Answer:
Hi dear and thanks for your query to HCM.

I have read your question and understand you,but I will need your last menstrual period to calculate your close date that you have conceived.

From all data you have write ,you may have conceived at 11 March ,but it isn't an exact date .

Please feel free to ask further question .

Regards

Above answer was peer-reviewed by : Dr. Prasad

Follow up: Dr. Vjollce Mbiarra (18 minutes later)

My lmp was Feb.14th but my cycles are irregular and always late. I am concerned on the dates because the 25th was with someone I am hoping is not the father. I am planning on doing a paternity test but would like an expert opinion. I am mainly concerned because my dating US was at 17weeks 4 days

Answered by Dr. Vjollce Mbiarra (19 hours later)

Brief Answer:
Chances to conceive Feb.25th are very very small

Detailed Answer:
Hi dear again!

I have read your question and I will try to explain you.

If your cycle is irregular and longest than 30 days than chances to conceive at 25 February ,because your ovulation start after 14 days .
But baby's paternity is determined only by doing DNA test .

Regards

Above answer was peer-reviewed by : Dr. Prasad

Follow up: Dr. Vjollce Mbiarra (26 minutes later)

So you are saying that I should do a DNA test but the chances that the baby resulted from the 25th are slim? I appriecoate your answering my questions, thank you.

Answered by Dr. Vjollce Mbiarra (35 minutes later)

Brief Answer:
It is the only exact test

Detailed Answer:
Hi dear again!

DNA test is the only exact test to determine paternity.

Regards

Above answer was peer-reviewed by : Dr. Prasad

Follow up: Dr. Vjollce Mbiarra (39 minutes later)

I realize that. However based off the due date of Nov. 27th when would ovulation occur?

Answered by Dr. Vjollce Mbiarra (23 hours later)

Brief Answer:
Explanation is given below....

Detailed Answer:
Hi dear again!

If your due date was November 27 th than your conception time is after March 5 th but conception time can't determine exactly.

Regards

Note: Revert back with your gynae reports to get a clear medical analysis by our expert Gynecologic Oncologist. Click here.

Above answer was peer-reviewed by : Dr. Raju A.T