### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I was very desperate for a job and had unprotected sex with a guy who promised me a job on the 7th of March 2014, I took morning after pills on the 8th March, first day of my last period was on 16 March (of which I was convinced the pill worked). I then had unprotected sex again (after my period) with my boyfriend several times but don t recall the dates (somewhere from March 10) . I found out I was pregnant on the 10th of April and went for an ultrasound on the 30th of April, my Doc said I am 7wks 5dys preg. How accurate could that be as I believed at the back of my mind that I am between 5-6wks pregnant. Could it be possible that the pill didn t work? I m scared and confused that it might not be my boyfriends. Please help. I am losing my mind and can t seem to not stress about this mess I put myself in. I also have one more concern please, my period was normal as it lasted for 4-5days, *sigh* my boyfriend and my mother know about the pregnancy as we (my boyfriend and I) were pretty much planning to have a child together but the ultrasound dates just really gave me a huge slap on my face. The ultrasound based on the measurement of the embryo showed that my due date is on December 12, 2014 (my doctor didn t ask me when my last period was) I am also a bit confused about two other things as well - the first one being when I use the due date calculator by sonogram (reverse calculation) it says that I conceived on March 21, (how long does it take to conceive after sex) then the second calculation based on my first day of LMP which was March 16, shows that conception date was March 30. Am I chasing empty pavements or none of this changes anything? I had a miscarriage last year and really wanted a baby but not that of a man I don t even love.

### output:

Degree understand your concerns went through your details. Sperm life within moist vagina is up to 48 hours. If sperm cell could not find a way into the ovum, within this 48 hours, the sperm cell dies. Sonogram shows the growth of the embryo, and it could be possible that the embryo had grown a bit faster than usual. That happens in many cases. The tentative delivery date is calculated based on the general arithmetic and assumption, but there are techniques like this too. I don't think you have anything to worry about the current scenario. Doctor said 7 weeks and your calculation is 6 weeks. The matter of 7 to 10 days tolerance is normal. Note that almost all pregnant women give birth at least a week or more before the tentative delivery date. Don't worry. You may talk to your doctor in detail. Don't be shy and afraid to talk to your doctor and clarify your doubts. Take care. If you still need my assistance in this regard, please use this link. http://goo.gl/aYW2pR. Please remember to describe the whole problem with full detail. Hope this answers your query. Available for further clarifications. Good luck.