Ttc for the first time need some advice.

This is our first month and I have been on birth control pills. I’m almost finished with my period. When to I start testing for ovulation? I usually go 2 or 3 Months before I have periods once I stop birth control. I have always been irregular every since I started having thyroid problems. I am on thyroid meds but my periods still always changes. Is there any meds I can take to help my periods become regular on their own ?

I am 25.