Effects?

Iz
I'm about to run out of my pills and because we have moved fairly recently, I haven't had a chance to register with a GP yet. I will do it tomorrow, but I doubt I can get an appointment before Christmas.  
I know I will need to use another form of protection, and I know I probably won't get my period, as I am on the progesterone-only pill.
Are there any other effects on my body I can expect if I don't take the pill for like a week?
Thanks 😉