there is a possible 2 fathers...

hi i am 19 +1 and was woundering if anyone could put me at easy a little bit. i have been given a edd off 22nd aug 2012 there is a possible 2 fathers. my last partner n me didnt sleep together till 19/11/11 and i didnt have a period while i was with him, my partner b4 him we was sleeping together up untill and after that date. i dont really know my last lmp date i know i had a little bleed which lasted not even 2 days which is not normal for me. HELP ME PLZ :=/