Ovulation and period after chemical pregnancy

When should I expect my next period after a chemical pregnancy?

I started bleeding 3 days after my missed period.

My normal cycle is 27 days. Will my next period be 27 days after I started bleeding this month? Or 27 days from my missed/normal period date? Or does it take time to go back to normal?

I'm not sure when I will ovulate either... maybe use an OPK for this month?