Can I be Pregnant?

Alright ladies I need some help. I've been reading on the internet about some things and just need some guidance from some girls who might know about it. About 15 days ago me and my SO had shower sex and he didn't cum inside of me but he pulled out and finished on my back. I am on the pill but I hadn't stared my new pack until the day after it happened. But I stood up and rinsed it off but it went down towards my lady bits and I'm super worried that there is a possibility there's a little human inside of me. The concern is 9 days after the incident I started bleeding moderately and I read about implantation bleeding on the Internet but I stopped bleeding after 5 days. Is there anything I need to be worried about?