This is super tmi and I’m sorry but I’m worried

So I had sex and he came inside me a little so the next morning I took the plan b pill and the next day I felt sooo sick so I figured it just the pill okay so then I’m a couple days I start bleeding. Then it got worse the next day and then today this came out of me and it’s disgusting I’m sorry but does anyone know what it is or if I just have a really bad uti?