Could I get pregnant???

okay, I’m pretty sure the chances are slim to none, but I freak out over everything. me and my my boyfriend were making out and we were grinding on each other and then he started rubbing his dick on my vagina and like I spread my legs kind of wide. he didn’t go in, but the head was basically almost in and he didn’t have a condom on. I’m on the nexplanon implant. But I just want to be sure