Miscarriage-only bleedingwhen orgasming

I was told I had a miscarriage 3 weeks ago due to HCG levels being at 10, at 6 weeks. Since then, I only bleed as in spotting, when I orgasm. If I don’t have an orgasm, I don’t bleed at all and only spot the tiniest bit and it’s brown. Like old blood. Any idea what’s going on??? I can’t stand this anymore.