Blood after sex

Almost 19 weeks with my first and I had sex with my husband for the first time in a couple weeks this morning, we don’t do it often anymore because it kind of hurts and is just uncomfortable for me at this point. Went to the restroom immediately after, wiped a few times and there were traces of blood on the toilet paper, not a whole lot at all, just some small streaks of light pink/kinda reddish blood. Sex did hurt more than usual this time, I’m just wondering where the blood is coming from and if I should be worried? No cramping or anything. Thanks in advance for responses