I took plan b march 30 got period feb10. now i have missed period for 3 days. hpt (18 days after intercourse) all negative.am i pregnant or is it plan b?

Hard to say: We need more information to give a better response. Need to know when you took the Plan B in relation to intercourse. Remember, however, that plan b, when taken properly, only decreases your chances of pregnancy. It does not guarantee pregnancy prevention. Your period is now 3 days late. You could either repeat the pregnancy test after 4 days or you could see a gynecologist for a blood preg test.