I’m 17 and I’m Scared

I haven’t used this app since middle school and back then I used it for tracking my period. Now I’m back but in need of some help? Honestly I’m not sure what I’m looking for. If I’m pregnant then there’s not much I can do by being on here, but I’d like some advice from women who’ve been in my shoes. My last period started on 12.26.20 and continued until the following Tuesday/Wednesday. This past Monday my boyfriend and I had sex. It’s stupid but for the last few months we’ve been off and on with condoms. And on Monday when we chose to use condoms it broke on us. I took Plan B One-Step within the next hour. I wasn’t producing any discharge before, on, or a couple of days after. But today I was spotting. I usually have reddish/brownish discharge plus some clear discharge pretty regularly. But I’m scared. I’m really really scared. Stepping into the shower I saw a little bit of blood on my inner thigh and I thought back to the article on implantation bleeding. It hasn’t even been a week yet but my anxiety knowing that this week (according to eve) is my most fertile window is making me wonder whether or not I’m pregnant. Until my actual period occurs, I know a lot of my worrying is pointless. But having to wait until then without anyone to really rely on...I just want some advice and knowledge about my body. I know I sound really ignorant since I chose to have sex in the first place, but I’m lost and I’m scared and I want to know what my chances of being pregnant are.