18 weeks

lately when I've went to the restroom I've wiped and there's been a little bit of blood on the toilet paper, it doesn't happen every time I wipe just randomly throughout the day and when it does happen it's a tiny tiny bit of blood like just a little bit of spotting and it goes away. I'm not having cramps or anything unusual with it, anybody knows what it could be?? Btw, I had sex 2 days ago