Had a period Oct 6th and was normal...my next period i expected between Nov 4-6. well Oct 30th i had a light period that lasted about 4days ending in brown discharge. Had sex during what i thought was my population period. Nov13to my surprise i started bleeding again which Was 2 days after having sex. Now goin by that date i was due for my next period 27th which is a no show. But my normal period shouldn't b until around maybe the 3rd or 4th of December what could b the Cause? I have never had this happen