I had this too. Very common. Congrats on the pregnancy!!
Bleeding after sex is normal. I know this isn't sex but when I did the pap smear my doctor said I would bleed and I did. Your body is swelling down there with extra fluid. I'm almost 33 weeks and hurts to have sex I'm swollen. As long as it's not red, clots or bleeding with cramps you are good. Talk to your doctor as well for what is good blood and what isn't