Need help

I already plan on making an appointment to see a doctor however I wanted to ask you ladies... has anyone experienced burning after sex? Or burning after masturbation? I only have 1 sex partner and I don’t have an infection and I do have a kid. I’ve read that it could be because things aren’t the way they are down there after having a kid!. However is it normal? I always get a burning sensation after having sex and not always but sometimes I get a burning sensation after I’m done masturbating. I was on birth control (the shot) and I got off because my hormones where crazy but aside from all that I was not and still am not in the mood. I could go days without sex and I would be perfectly fine it’s like my body doesn’t care for it.