Irregular period after MC?

I had a MC in August and my periods have been extremely light and irregular since then (coming 3 or 4 days late and then bleeding for one day). I used to be super regular so I am afraid it’s a sign in not ovulating? I started opk this month and haven’t gotten a positive at all and was meant to ovulate yesterday. Wondering if anyone else has had a similar situation? Hoping this month is our month but don’t feel very positive about my situation.