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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How To Determine The Date Of Conception?

I want to know actually when i have conceived i have irregular cycles My july month period was 4th july and on 29 july i had non penetrive sex with stranger..from 29 july i started taking duphason on 8th august i got spotted in brown colour following periods ib brown colour..nkw my question is On 8th august it was my period or implantation bleeding.. From 19 august i started to have sex with my hubby And on 30september i had ultrasound it dated me 7 week 6 days gestational age.. On 31st october ultrasound dated me 12week 3 days Now my question is when did i get pregnant ..can 29 july incident had made me pregnant? If 8th august was my lmp the y does ultrasound dated me 6th august, have i conceived befire? My due date as lmp is 15 may And by ultrasound is 12 may Please help me to find when conception whould have occured And my mise important question is can ultrasound be wrong?
Fri, 29 Dec 2017
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OBGYN, Maternal and Fetal Medicine,  's  Response
Hi..you have had two early pregnancy scans..that makes the pregnancy dating accurate..according to your ultrasound your pregnancy is most probably not the result of your 29th july sex, but has occurred after that. In fact around 13-14 days after 29th july, i.e. around mid august, fertilization and conception would have occurred.
Your 30th sept scan shows 7 wks 6 days i.e. around 2 months, which means lmp is around 2nd august and your due date accordingly would be around 9th may next year.
Again your 31st october scan also corresponds ,showing 12 wks 3 day preg i.e around 3 months.(lmp around 4th aug).
So you can be pretty sure that you have conceived in mid august and will be due around 9th may next year.
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How To Determine The Date Of Conception?

Hi..you have had two early pregnancy scans..that makes the pregnancy dating accurate..according to your ultrasound your pregnancy is most probably not the result of your 29th july sex, but has occurred after that. In fact around 13-14 days after 29th july, i.e. around mid august, fertilization and conception would have occurred. Your 30th sept scan shows 7 wks 6 days i.e. around 2 months, which means lmp is around 2nd august and your due date accordingly would be around 9th may next year. Again your 31st october scan also corresponds ,showing 12 wks 3 day preg i.e around 3 months.(lmp around 4th aug). So you can be pretty sure that you have conceived in mid august and will be due around 9th may next year.