My period has never been on a timely schedule and sometimes my period do come a couple or few days late. In addition, I have not had sex since the end of May, maybe the first week in June. I had a period, a full blown period, it was heavy, heavier then normal, bigger clots then normal, cramps so bad I couldn't move. So I really doubt that pregnant considering I haven't had sex in a month and some change and already had a period. I just wanna know if there are some other reasons why my period could be late ?