I have pcos so have never particularly had regular periods but i seemed to be getting them back…

I have pcos so have never particularly had regular periods but i seemed to be getting them back after my miscarriage in april. If i calculated right i should have been starting my period today but its been a no show. My boobs have been tender on and off and had very random nausea over the last week. I have the coil in so can't be pregnant and that coupled with my pcos i doubt it could happen that easily. But anyone got any ideas as to why i am feeling this. Are they normal period symptoms. Having had very few i dont know what's normal. I normally go 12-15 months inbetween periods. :) any advice is welcome. Thank you x