New here. Miscarriage and TTC

Jenni
My story. I had a MC on June 15th. HCG level were a 2 in June 25th so nurse said I no longer have to get blood drawn. Recently, I have had mild cramping that started Monday. It has been 3 weeks 3 days since my MC. Today I experience mild on and off cramping and a slight brown discharge. I'm hoping it's my cycle coming so I can be back to normal or at least half way there. I've Googled searched but couldn't find any answers. My nausea, headaches and tender breast haven't stopped. The nurse thought that was strange. I don't go back to the Dr until the 28th bc they thought they saw something that look like a cyst. Before this my bf and I have had sex once about a week or so ago. Is this an indication of a cycle?? Anyone else experience this?