Irregular Period after MC?

Samantha • 29. wife. pregnant with baby #2!
I was very regular before getting pregnant, then I had my MC in October. I had my first AF the first week of December, then 2 weeks later started again 😣 is that something anyone else had experienced? It's making it difficult to figure out when I'm ovulating since I haven't gotten into using tests (which I guess I might have to)