CD16 - Still Low Fertility Reading

Pebble2018

I had a miscarriage in December & my cycles have been a bit strange since.. I’m on my fourth day of low fertility readings with the clearblue digital OPK’s & I’m on CD 16.. I don’t understand it last month I had about 8/9 days of high readings before my peak.. my cycle is approx 32 days long.. any advice would be appreciated..