Change in AMH levels?

I was just looking at the results for the 3 AMH tests I’ve had over the last 2 years and was wondering if anyone else has seen any change in their levels?

In June 2017 it was 0.42 ng/mL, in September 2017 it was 0.58 and in December 2018 it was 0.95.

I did have to stop taking some medication for an autoimmune disease so I’m wondering if that may have impacted the low AMH.