Hi. I have my period every 30 or 31 days and my last period was on March 11th.. I had sex on the 19th,22, and the 31st. I did not have any protection. and i took an pregnancy test (10 hcg ml) on the 2nd or 3rd of april and it was negative..please help! thanks!
You would be expecting your period around April 10th or 11th. A pregnancy test isn't terribly accurate a week before you miss your period. It could be a false negative... or it could be a correct negative. I would say it is just too early to tell. The test will be more accurate as you approach the time of your expected period.
As for whether you got the correct day, it's hard to know when exactly you ovulate if you are not charting at all, but if you have an 'average' 14 day luteal phase then you probably ovulated some time around the 27th. The 31st would be too late and the 22nd probably too early, though it is theoretically possible for sperm to stick around for 5 days. On the other hand, if you have a 10 day luteal phase like some of us, the 31st would be bang on. So given the information you have, the best we can do is guess.
If you are trying to get pregnant, next time have sex more often and for longer! ;)
You might also want to check out this page which collects resources for learning about your cycles. http://www.mothering.com/community/a/resources-for-learning-about-fertility-cycles
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