TMI help please

I had sex with my bf without a condom a week ago. I know that it isn’t very accurate, but the app said that it was the day before my fertile day. We did it for a few minutes but stopped before he was even close to finishing, as we got too worried. I took plan b a few hours later. Today I felt bloated and crampy in the morning. When I went to the bathroom and wiped I noticed some blood. Nothing much though. I thought I was starting my period so I put on a pad. A few hours later when I went to the bathroom and wiped there was nothing much. A little bit of brown discharge and my pad had some red/brown blood on it (it wasn’t a lot). Recently, when I wiped I keep getting a bit of brown discharge and then a bit of brown/pink blood.

I’m really freaking out. Is this from the plan b? Is this implantation bleeding? Could this mean I’m pregnant?

I’ve read the plan b pamphlet many times, and I’ve searched on the internet, but I’m really scared and starting to overthink. I just need some opinions and help with this.

Thank you!