TTC after miscarriage

My husband an I has a miscarriage summer of 2018. Since then weve been TTC with no luck. Part of the problem is my periods. As long as I can remember I could tell you when I was going to get my period but since the miscarriage I've not gotten back to normal. Periods come early, come late, last 4 days up to 13. It's hard to tell when I'm ovulating or if I'm ovulating at all. I had blood work and an internal ultra sound and everything checks out fine. Anyone have experience with this? Thank you for taking the time to read!!