Bleeding after a positive test?

I'm pretty much freaking myself out here.
I've been pos like crazy because i and my boyfriend have a feeling that i'm pregnant. We've been trying forever with absolutely no luck. 
I've been taking first response 6 days sooner tests. They're negative up until right before the time limit and then they turn very faintly positive. It's super weird, anyway, i'm still 3 days before my period is due. And tonight i started to bleed a little. It was pink, definitely noticeable but not really heavy. 
I don't feel any differently, and i'll test again in the morning. 
But has anyone had that and gone on to have a successful pregnancy or am i probably having a chemical?