I stopped my yasmin and was due to start my period on last wednesday (2 may) and i have not yet started. i had unprotected on april 13. should i worry that i might be pregnant?

Pregnancy ?: Yasmin is a low dose oral bcp, and unless you have not taken the first of a new pack of bcp's beyond the seven days of placebos, it is unlikely that you are pregnant. Even missing a couple days before re-starting the active pills can cause you to ovulate, and pregnancy is possible. Get a serum HCG test to be certain about pregnancy.