guys I am freaking out please answer me :(

Okay so almost 2 weeks ago. I got the nexplanon implant. I had sex today... and the condom broke when he came... he says he pulled but we think some may have gotten inside of me.. The doctor said the implant worked within 7 days after getting it. But I'm scared because what if it's not inserted right ? It's near the surface of my skin.. or one of my friends told me that my body could reject it. My arm doesn't look swollen anymore.. but I am still scared. I really need advice. I am bawling because this has never happened to me before and a million things are running through me. Also I was halfway done with my pack of birth control pills when I got it so I've also been taking them at night just not at the same time so I could finish off the pack. Anyways any comments would be greatly appreciated!! Because I am so scared and I need help.