Period acting up

Lisabet
Okay. So I was suppose to start my period yesterday and nothing happened. No blood, no smell of period, not even brown discharge. I took a pregnancy test this morning and nothing. Nothing at all. 
This NEVER happens. I'm on the pill so my periods are pretty regular.
I got blood drawn today and I asked if they could check if I'm pregnant too. 
I'm so confused..
Somebody please give me any ideas on why this may be happening.