Sex after last period. strted new bc pack. cnt remember if i missed any pills. used pull out method, mssd recent period. stress? or pregnant?

Maybe not pregnant: If worried, just do a pregnancy test. A urine test done correctly gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened). 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. If a woman has her normal regular period, then she is not pregnant, and a test is not needed.