How long does it take?

How long did it take for everyone’s cycles to regulate after coming off of birth Control? I had been on 4 different ones from June 2016-may 2017. My cycles used to be 28-30 day cycles. When I came off of my birth control my first cycle was 34 days. Second cycle was 36. Third cycle was 33 days, I had a chemical pregnancy that month. fourth cycle 31 days. Fifth cycle was 31 days, had a chemical pregnancy this month as well. I’m wondering if my hormones are not back to normal yet and that’s why I’m having these chemical pregnancies. I’ve had two healthy pregnancies prior to trying for our third.