What's going on?

Nattie • N V Cull
I had 3 faint clear blue positives, then started bleeding after being nearly a week late, even when I bled I got a positive then another which was a lot fainter later on that day. Went docs they did a dip test and he said it was neg. 
period is pink, really light then randomly goes really heavily, then it stopped and cervix closed then after I had sex ( sorry for tmi ) it bled again then slowed down stopped and it's doing it repeatedly. Anyone know why?