melatonin and delayed period?

34F. Very regular and predictable periods. Sometimes a few days late if I'm super stressed.

I was one week late last cycle (but had a lot of stress). As of this cycle, I am 2 weeks late with next to no stress. I have never been 2 weeks late.

Negative at-home pregnancy tests, (blue dye, pink dye, digital, tried them all). Married so there's always a possibility of pregnancy.

The only thing I did different is I started melatonin under my doctor's recommendation right before that previous late period, due to OCD rumination causing me significant issues falling asleep. I have been taking 5mg every single night. It really helps me out, but could it be causing me issues now with my cycle?

Anyone have a similar story? Did you have to stop it before every getting your period?