HCG levels and ovulation/period🤨

Be

Hi,

Just had a all from the hospital and although I have a small amount of retained tissue (7mm) my hcg has dropped from 70 on Friday to 37 today.

I totally forgot to ask and was just wondering if anyone knew how low the levels need to be before I’d expect to have a period or ovulate?

Midwife said tissue should come out with my period, I’m guessing I would ovulate until after that?

Any help appreciated - thanks in advance xxx