please help!! b

I just had pretty rough sex and I got home and peed. This is on my pants, I wasn't wearing underwear. It's also there when I wipe. My boyfriend finished in me last night and I am on birth control, take it perfectly. I'm sometimes scared if I have loose stool after I take my pill (which I'm perfect at doing) but I asked my doctor and she said it won't mess with my pill. The main quesrion is: I'm on cycle day 24 and worried this could be implantation bleeding. Like really worried. Could it be? There's no mucus and it seems like more blood than it should be, so like maybe as a result of the sex I just had? I'm really scared, this has never happened before. Opinions?