I’m dumb...

So my boyfriend and I were messing around earlier and I started to give him a blow job. Well then we stopped and got a condom but started making out again. Then we started having sex and I got on top. He started rubbing my clit but had licked his fingers before doing so. I was so into it that I didn’t even think about it. Could the precum from me blowing him a few minutes before transfer from my mouth to his and then he lick his fingers and transfer it to my vagina? I’m also on nexplanon but I’m a little overweight and I know that sometimes birth control isn’t as effective when your over weight. I’m a nervous nelly and that’s why he also wears a condom