PLEASE help!

Karina
Ok with my first pregnancy I didn't bleed until once I had sex while being pregnant. She was born at 39 weeks 2 days. 
Now yesterday I got a faint line and this morning I wiped in the bathroom and it looks very light.  AF is due tomorrow but I'm not sure if maybe my body is reacting. I wouldn't know what's going on. I'm open to suggestions.