I had protected sex and got period 2 days later and bled for 3 weeks. now my next period was due yesterday and hasnt come. am i pregnant?

Maybe not, but...: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result. One can test 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. In general, young, fertile couples having sex tend to get pregnant and have babies.