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How To Determine The Date Of Conception?

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Posted on Wed, 26 Aug 2015
Question: I had my period January 11th. I had sex on the 15th 16,17,18,20,21. My first ultrasound said I got pregnant on the 25th? I was wondering if those things are like right all the time. I have read they can be spot on or as much as 2 weeks off. When I went back they measured again and instead of being 12 weeks I was 14 weeks. They doctor said they measured wrong. So is it safe to assume I got pregnant about 18-21st of January? My due date was October 18, now changed to October 8
doctor
Answered by Dr. Sandip Kabra (35 minutes later)
Brief Answer:
Quite possible.

Detailed Answer:
Hi,
Welcome to health care magic,

Ovulation occurs generally at the middle of the cycle means if your period has started on 11th XXXXXXX and if we assume you have normal regular period of 28 days cycle then we can say you had ovulation on 25th XXXXXXX

But ovulation can also be prefixed on 3 days prior to that means it can also occur between 22 to 24th XXXXXXX

Now,if you had a intercourse on 21st XXXXXXX and suppose your ovulation had occurred on 22nd then there is chances of fertilisation there because sperm can stay alive up to 48 hours in vaginal mucosa.

In addition,

by ultrasound, a doctor can approximately say about the fertilisation day but one can not mention exact day which is itself very difficult to judge after a certain days of pregnancy.

So,your due date will be around 10th October to 13th October which is quite possible.

Hope this will clear your doubt.

Regards,



Above answer was peer-reviewed by : Dr. Raju A.T
doctor
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Follow up: Dr. Sandip Kabra (1 hour later)
Yes I had missed my period on February 1st. So my cycle is shorter than the average hints why I took the test on Feb 2nd. That would me i ovulated earlier prob around XXXXXXX 18-21st?
doctor
Answered by Dr. Sandip Kabra (4 hours later)
Brief Answer:
Yes,it is possible.

Detailed Answer:
Hi,
Thanks for the follow-up.

If your menstrual cycle is shorter than 28 days and if it is 21 days as stated by you then it is quite possible you to get ovulated around 20th XXXXXXX

Regards,



Above answer was peer-reviewed by : Dr. Yogesh D
doctor
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Follow up: Dr. Sandip Kabra (28 minutes later)
Yes as of right now I'm 31 weeks and 3 days. So I guess that would make it around that time
doctor
Answered by Dr. Sandip Kabra (7 minutes later)
Brief Answer:
May be.

Detailed Answer:
Hi,
Thanks for quick follow-up.

If we count from 11th XXXXXXX then it would make 30 weeks and 3 days (213 days) means your 31st week is running.

Regards,
Note: For further follow up on related General & Family Physician Click here.

Above answer was peer-reviewed by : Dr. Prasad
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Answered by
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Dr. Sandip Kabra

General & Family Physician

Practicing since :2009

Answered : 3078 Questions

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How To Determine The Date Of Conception?

Brief Answer: Quite possible. Detailed Answer: Hi, Welcome to health care magic, Ovulation occurs generally at the middle of the cycle means if your period has started on 11th XXXXXXX and if we assume you have normal regular period of 28 days cycle then we can say you had ovulation on 25th XXXXXXX But ovulation can also be prefixed on 3 days prior to that means it can also occur between 22 to 24th XXXXXXX Now,if you had a intercourse on 21st XXXXXXX and suppose your ovulation had occurred on 22nd then there is chances of fertilisation there because sperm can stay alive up to 48 hours in vaginal mucosa. In addition, by ultrasound, a doctor can approximately say about the fertilisation day but one can not mention exact day which is itself very difficult to judge after a certain days of pregnancy. So,your due date will be around 10th October to 13th October which is quite possible. Hope this will clear your doubt. Regards,