Sperm and Nexplanon

Hello guys so whenever my boyfriend and i have sex he usually comes into me and i wait for him to give me a napkin to get it out but while he’s doing that, the sperm is still inside me but i’m on nexplanon? do u think I’d get pregnant from that? holding the sperm or letting it sit in while i wait for a tissue?? do you guys think i’m okay? I’d really appreciate the advice or opinions

Thanks!