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I didn't have a period last month. Pregnancy test came back negative. This month I got my period on Friday night after unprotected sexual intercourse and ended Sunday afternoon. My period is usually 5 days. I was having cramps rele bad for a week and a half before which never happens to me And was neasious when I ate. I been constipated for the last week or so also. I never have a problem going. What could be causing this? Could I have conceived this month?

You maybe. Best to go and do a blood test. That will give you accurate results. It's common for some ladies when pregnant to hve spots during their period dates.
Don't stress. Do a blood test.

Last month I missed my period. Not sure why but guessing because I came back from basic an the change in my diet.I had blood work done and I was not pregnant. The last week or so I had been having cramps off and on. I've only had cramps the day I got my period not for an entire week and a half! I've been constipated and with headaches also for about the same amount of time. I got my period Friday night, July 26th and it ended Sunday afternoon, July 28th. My periods are always 5 days! This is all very confusing to me! I'm also having a yellowish stringy discharge for about 2 weeks now. 3 weeks ago I was tested for std's, yeast infection, and bacterial infection which all came back negative. Could I have gotten pregnant in the last month?