Unexplected Bleeding

Me and my boyfriend were having sex after about a week of not seeing each other and I started bleeding. Well at first it was very dark red like a period and after I went pee and put on a panty liner, it’s now light pink. Please tell me if this is implantation bleeding 🤦🏽‍♀️ I took a plan b about 15 days ago and my implant is now protecting me. Dumb me waited before the implant was effective to have unprotected sex which is why I took a plan b. Anyways, is this ib or period?

This is after I went pee