Pregnant ?

Hi I got the implant inserted 5 weeks ago and I got told to wear the patch for another 5 days. I took the patch off on the Thursday and had sex on the Saturday ( 7 days after it got inserted) he didn’t finish In me but I should be ok because I’m still protected on my patch free week and I had the implant right ? 3 weeks after the implant was inserted, he came in me but should I be protected by then ? Ever since I’ve started the implant I’ve had irregular bleeding that was light and not enough for a tampon. But now I’m bleeding and it’s a bit more heavy and is red and not pink. That couldn’t be implantation bleeding could it ? I’ve heard stories about people getting pregnant on the implant and it’s just scared me.