So my boyfriend and I were fooling around, and he ejaculated on my chest while I was sitting on the edge of the bed. Most of his semen landed on my chest, but some fell on the top and inside of my thighs, so I was obviously worried about pregnancy. I was wearing underwear and washed off a few minutes after it happened, but I was still worried that some may have entered my vagina because I was wet. The next day, I bought the two-step version of Plan B, and the night it happened was the last day of my period. Long story short, I took the pills at around 14 hours after (1st) and 26 hours after (2nd), what are the chances I could be pregnant? Or am I just paranoid about this? How effective was the pill?
There is no chance you can be pregnant. But the side effects from Plan B will likely make you panicky and confuse you, so be warned that it is not pregnancy, but the Plan B messing with your cycle. For example, you may get withdrawal bleeding about 7 days after taking it. Your real menstruation may be delayed or absent, and your cycle may change dates and length a bit for the next few months.
You are right to keep your underwear on. At least one of you should always have underwear on. It is also good to end with his ejaculation and then clean up, rather than have him go first and start to worry.later about touching him and transferring semen into your vagina.