should I be worried about pre-cum!?!?

So I got on the shot and I didn't plan on having sex because I was still a virgin. I went and stayed with my boyfriend and we ended up having sex. He didn't have any condoms and we both thought my shot would work but then realized it wasn't effective yet. He didn't cum inside me but I'm kinda freaking out about the whole pre-cum thing. So I'm just kinda wondering if I'm freaking out over nothing?