first AF after early miscarriage?

Hi, I had an early mc at 5-6 weeks the beginning of March and the hospital told me to expect my first AF afterwards in 4-6 weeks. I'm now at 4 weeks and started spotting Friday and had AF symptoms. I've spotted for 3 days, really really light and now it's gone. I was hoping I'd have a good bleed and go back to normal. I don't know if I'll ovulate this month now if I haven't really had a proper period? anyone else got experience of this please? how long did it take for your AF to go back to normal? I'm Def not pregnant, I took a test