Was on my period for 4days it stopped, had unprotected sex that night, started to bleed again after sex it continued for about 5-6days. took next choice morning after pill morning after sex. cramped after stopped bleed. could i be pregnant?

Maybe not, but...: A urine pregnancy test done correctly gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened), or 1 week after missing a period or 1 week after getting an unusual period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test.