[Outofstyle]

Most often, girls will lose their period if their weight drops a significant amount (girls suffering from anorexia quite often do not get a monthly period) so that is why it is seen as unhealthy, and it could also raise concerns if you were trying to get pregnant and were having difficulties with that, but to just miss 1-5 periods over the course of a year isn't an extreme health issue, and I am assuming your period was normal before you started taking the herbs, so it was probably the herbs that took away your period and I don't think you need to worry about it, if you were to cut yourself off them entirely I'm sure it would come back within 3 months.

If you don't get your period this next time around, it could be something in the booby stacked cream (since you are not taking pm anymore?) so you can just stop using the cream 3-4 days before you expect your period to come and see if that brings it back.