Bleeding after sex. 4 weeks miscarriage

ANA • Mom of 2💙 💝
I'm a little bit nervous. Yesterday my husband and I had sex and I had blood on me down there red like brown. But when I took a shower and after not anymore. I had a D&C 14 June cause my baby didn't have a heartbeat measured 9 weeks. I'm expecting my periods now. Maybe it's the start of them? But now I went to pee and nothing. And i dont even have symptoms they are showing. Im worried. Should I stop having sex maybe my body it's not heal. ( we don't use condom and I don't take pills ) but I don't think I can be pregnant now cause he never came inside me... tell me please what could this be?