I took plan B three weeks ago two hours after having sex. We used condoms (and he didn't finish in me), they didn't break but I was worried about precum because he did rub against me (no penetration with the rubbing though), but I took it anyways because I'm a worry wart. I got my period 1 week after taking it and now it's been 12 days. Usually my period lasts 5-6 days. But this period is pretty light but it's still there. What should I do? Has this happened to anybody else? Should I get a pregnancy test just to be sure? I'm really worried although getting pregnant solely by precum is very slim.