Has this happened to anyone else?

Autumn

So in July, I had sex and the next morning I started my period. I should mentioned my periods used to only start with the help of Progesterone. However, I recently have been seeing an endocrinologist who put me on NP thyroid because she said I have an autoimmune thyroid disorder, which could be the cause of my irregular periods. Happy to say, since I’ve been taking the med, I’m having a 32-33 day cycle and not 60+!!! According to glow, in July my period was late by 5 days, but I’m still regulating!

This month (August) I had sex on the 30, and started my period the 31st. At cycle day 33. So not ungodly late. My question is, sex has induced my period 2 times now. Is something wrong? Or does this happen a lot?