I think its time to move on to OPK

Brianna • TTC my Rainbow Baby ! Miscarriage 12/26/14 & Ectopic with Left tube removed 5/20/18😇😇
I can't tell when I ovulate with my irregular periods .. I was wondering if any of you ladies have gotten pregnant with irregular periods while using ovulation tests ? Any brand you recommend? Do I test everyday starting at the first of the montht? All new to me any advice would be great !