My boyfriend and I had sex (protected-we useda condom) and I didn't use Plan B the next day. I'm not on birth control either. I am 4 days late on my period. I don't know if I should still get plan B (will it work if it's 2 weeks after, or will it start my period anyways?) and should I be worried about my late period? It's usually only 2-3 days late, and the weekend before my expected period I had severe cramping (worse that usual, but still a common symptom for me). What should I do?