I took plan b last week Tuesday at around 11am -12pm after having intercourse around 1am - 2am Tuesday morning. He didn't ejaculate because I pushed him off only after 3 strokes but I was concerned about precum so I took the plan b to be on the safe side. Well yesterday we did do some penetration but he didn't go all the way in and I'm expecting my period today I'm slightly concerned that I could end up pregnant.