Plan B

So I just recently stopped taking my birth control and was having sex with my boyfriend of one year and the condom broke. Not completely open but it was leaking a little. That was at about 1:00 pm and I was busy till I was able to get plan b at 9:30 pm the same day. I've felt like poop for the past 3 days after taking it and my stomach has been hurting a lot. Idk if the plan b worked or not. Any suggestions for any further actions?