I had protected sex Saturday night, the condom slipped off, I took plan b Monday morning. Should I be concerned about pregnancy? I know there's always a risk regardless of how careful you are, but I took all precautions necessary to prevent it, so I am just wondering what my chances are so I can give myself some peace of mind and stop freaking out so much. No rude comments please, just looking for answers from others who have been in similar situations as I. Also, now that I've taken plan b, I've read it can mess with your hormones, so should I expect my period to come earlier than usual/late?