I had sex with my boyfriend on 3/21 and the condom broke. I'm due for my period 3/24 but I normally get it a day or two early. I took the Plan B One Step pill about an hour after the incident happened. The only side effects that I've had are some headaches, fatigue and slight abdominal pains. I do have tender breasts and my hormones are all over the place but that is part of my period symptoms seeing as though I had them days before the 21st. I know the pill will most likely delay my period. But what are the odds of becoming pregnant knowing all this?