Help!!!!! TMI PIC!!!!!!

So my period came a couple of days ago. I started getting light brown blood and then two days ago I started getting more red and pink blood. My pads use to get completely  packed but it's really light. Background: I haven't had sex in six months I had sex with my boyfriend with a condom he didn't finish we checked the condom it was perfect. I have taken three tests all say negative. 
Could it be because we haven't had sex in so long my period changed/I have been stressed for this month as well!!! Should I be worried? This is how my blood is looking!!!!