I don't feel anything.....

I am soooo confused af was due to come today (by glow) I don't think it's actually due till Monday, however normally straight after ovulation I have the sorest boobs and general back aches and cramps during the week up to af. This month NOTHING and I mean nada, no boob ache no cramps no back ache no nothing, slight mood swings but not my usual pms. Any ideas? I mean I can't be pregnant because surely I'd be the other way ?