[black eyed susan]

any tips for herbs/supplements that don’t mess much or at all with a naturally normal/stable period/hormone cycle

Most NBE herbs don't mess with a naturally stable cycle in most women, but they do for a minority. It's not really which herbs that someone takes, but the specific effects they have on a particular person and how that individual reacts to them. I mean you could get several recommendations about herbs which haven't disrupted anyone's cycle, but the same herbs could still possibly do so in your case.

Welcome to the forum by the way!