Ttc after miscarriage

Hi! I had a miscarriage in April at 5 weeks everything was natural and over in 3 days, my next period after that was cd 42 and the next period was at cd35 so I was hoping this month I will be back down to cd28 but I've been using opks for the first time and I should be ovulating now but according to them I'm not? Has anyone else been messed up after mc? Does it go back to normal?