Advice please.

My periods are like clockwork and I was due on Sunday 13th and still no show?

I have been off the pill for around 2 years now and me and my partner have said we will see what happens!!

I’m now panicking as I have done two tests and they have both said negative I feel bloated and my knickers and trousers are a bit uncomfortable and as embarrassing as this if I keep feeling like needing a number 2 and struggling to go my breasts aren’t tender at the moment which they are normally before a period but other than that not a lot has changed other than no SIGN of this period. A year and half ago I had the highest grade pre cancerous cells removed and im worrying something has come back although when I had them my periods never changed! If anyone could offer any advice it would be greatly appreciated. Thank you.