Implantation Bleeding or Take Action Side Effects?

My friend and I had unprotected sex a few times one night after drinks (normally we’re protected). He says he didn’t finish in me either time but I was worried that he didn’t pull out in time and with it being within the last 2 days of my ovulation window, I took a Take Action pill roughly 12 hours later (because I got home really late). I’ve taken one before (with a similar timeframe but took it right after) and didn’t have any side effects outside of the ordinary PMS symptoms and my period came on time. However, this time I’m experiencing an extremely light flow of brown blood (a bit much just to be spotting) and it’s just a few days before my period is supposed to start. With everything going on right now my anxiety has been through the roof so I don’t know if I’m being paranoid or if I have something to worry about.