When does my cycle start over?

Kelsie
I was suppose to start my period 10/26 but it still hasn't shown and I've gotten all BPN. So I'm assuming I'm just not getting a period this month (which isn't unusual)! 
If I never get a period, how do I know when my cycle starts over?!
I was reading about the sperm meets egg method, which I want to start, but idk when my cycle starts! 😫
Any and all info/advice is greatly appreciated!