Bleeding help

I'm almost 16 weeks and very lightly when I wipe twice now I've had some pink blood. I have cramps but it's the normal round ligament ones. I'm just wondering if I should worry? Am I okay, is my baby? I've had a mc in the past so I'm freaking out. I did have sex last night too so I'm wondering if that has anything to do with it? No bleeding right after that though. Please pray for me ladies and give me all the advice you have!