It's Light.

So my period started yesterday. My boyfriend and I had sex two days before my period. I don't think I'm pregnant and we used a condom. (Plus I do like some heavy checking after sex especially when it comes to condoms. Like I fill it up with water and squeeze to make sure the cum hadnt found a hole or something to come out.) My concern is, my period is light almost like its old blood. I don't know if that's normal or what but it's not like my normal heavy ones that have fresher blood. Should I be concerned? Plus we've had sex the day before my period once and it was extremely heavy so I figured it'd be the same for this but am I wrong?