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How To Determine The Date Of Conception?

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Posted on Tue, 20 May 2014
Question: Hi, if I had my period on march 10th, and had unprotected sex every weekend after with march 31rst being the last encounter, and on this specific encounter he didn't orgasm, and. Took the morning after pill 8 hrs later. 5 days after the last encounter I took an at home pregnancy test and was positive (April 5th).... On April 18th, I had a dating ultrasound and it dated me at 5 weeks 4 days. What is the likelihood that the pregnancy was caused from the march 31rst encounter?!
doctor
Answered by Dr. Rhea Chanda (10 minutes later)
Brief Answer:
less than likely

Detailed Answer:
Hello,
Its unlikely that you got pregnant from the march 31st encounter. With a scan dating 5 weeks, its likely that the pregnancy occurred sometimes mid march. It must have occurred a couple of weeks after your period on march 10th.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Rhea Chanda (7 minutes later)
Can you please explain a little more please?!?
doctor
Answered by Dr. Rhea Chanda (4 minutes later)
Brief Answer:
explaination

Detailed Answer:
If you had a scan saying you are 5 weeks pregnant on 18th April, then you have conceived during the fertile phase after your LMP on march 10th. That would approx be around 24-25th march. 31st march would be out of the fertile phase. Hence you had to have concieved before that.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
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Dr. Rhea Chanda

OBGYN

Practicing since :2005

Answered : 3161 Questions

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How To Determine The Date Of Conception?

Brief Answer: less than likely Detailed Answer: Hello, Its unlikely that you got pregnant from the march 31st encounter. With a scan dating 5 weeks, its likely that the pregnancy occurred sometimes mid march. It must have occurred a couple of weeks after your period on march 10th.