I was with my boyfriend on march 7. i am still a virgin, but some things happened and he finished on my chest. then i was missing my period for 18 days and then it came. now i am missing my period for 17 days. is there possibility that i am pregnant?

Some things happened: 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 very reliable result by 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. Home pregnancy tests are fairly cheap to buy, and are sold in stores everywhere.