How Do I Predict Ovulation if I haven't had a period in 2 years due to IUD?

So question says most of it. I had been on Mirena a little over 2 years. I had the IUD removed Dec. 31st. My husband and I are TTC, but I don't know where to start. Everything I look at says when was your last period or how long is your cycle. Well, I have no idea thanks to the Mirena. I'm 36 and feeling anxious about my fertility. I very much want to become pregnant. But how can I track my ovulating days with no period knowledge? I guess I just have to wait until I have a normal cycle (I haven't had one since removing the IUD).

Unsure where to start.

Thanks.