OK this is gonna b kinda long but I need to put every detail so you all would understand. Okay my last period was January the 5th 2013 ended on January 11th I had a pap in February and also pregnancy test thru blood came back negative n pap came back normal still no period by the end of February. than March came around I had sex with an ex with a condom that was beginning of March...my bf of 4 years decided he wants me back even though me n him were still very much sexual active before than since we been together n we never use protection anyway my period still didn't come on for March I took 3 pregnancy test all negative so now were in April n still no period my period usually come on the beginning of the month like 7,8, or the 9th so on the 21st I went to the er n they did an ultra sound n blood test n I'm 5 weeks prego I'm trying to figure out how in the hell did I conceive without a period all those months and also this baby is not my ex cause we obviously used condom n I checked after we were done to make sure it didn't pop. its my bf baby cause we never use protection n we r sexual active daily right? n obgyn said baby due December 15th how n wen did I conceive? n this is my bf baby right?