Bleeding

Hey all, I'm 6 weeks postpartum and had sex with my husband tonight. I just finished my period about 2 days ago, and this isnt the first time we've had sex, but we did do new positions (bending me over the bed, legs on shoulders) when I went pee I noticed I was bleeding a bit. More than spotting, but not enough for a pad. I'm slightly cramping. Should I be worried? All the other times we've had sex I've never bled?