I need reassurance

So here is the story. I’ve had my nexplanon implant right at a month. I’ve only had sex twice since I got it and I waited the full 7 days. My period is late but that not unexpected. I took a test and negative. Anyways, I’m kinda freaking out cus two days ago my boyfriend and I were messing around. I was giving him a blowjob before we had sex and was rubbing the shaft of his penis with my hand. I’m sure some saliva got on my hand. I only did that for like a minute before I put the condom on him. Now I’m freaking out that precum could have mixed with the spit on my hand and could transferee to the outside of the condom. He did wait like 30!seconds before he stuck his penis in but I’m so freaking out. I know I’m on the implant but I’m just nervous cus nothing is 100%. We had sex when I should have been on my period but never got it. I’m not sure that matters though. Do I have anything to worry about. I’ve had my nexplanon for a month so I should be okay right?