I had sex on a thur. he came in me twice. 4 days later i had a weird 3 day period. i've been feeling bipolar. always wanting to cry could i be pregnant?

Quite possible: If you had unprotected sex twice, it is very possible that you could be pregnant. I'm not sure about the "bipolar" symptoms you had unless you were somewhat anxious over the possibility of being pregnant. I suggest that you get a pregnancy test. You could see your doctor to get a test or buy a urine testing kit for pregnancy at the drug store. I wish you well.'.