Pregnant?!?!?

Okay so I’m 15 and me and my boyfriend started having sex I decided we should just not use a condom Bc I’m on birth control. I take it very diligently I never miss I’m always take it at the same time. So we should be good right? The other day we did like 5 rounds and he came twice I was afraid he got some cum inside me so I went ahead and bought and took the plan b pill.....guys I’m so scared I could be pregnant please give me your honest thoughts❤️