so i took a few hpt and 1 blood test..i told the doctor the time i had sex it was only once (the doctor said that it might be to early to test..) it all came back neg. but i still have syptoms and i got my period which was 2 weeks late (thats what had me worried i am always on time). my friends mom told me she bled with her 1st son like a normal period for 2 mo. and when she finallly miss the doctor said she was 3 mo. Is that common??