CD 31/no period

I'm on CD 31...was supposed to start my period today but still haven't, and it's 10pm where I live. Usually I start my period 2 days before I'm scheduled to start. I'll be late as of tomorrow. I'm kind of nervous..my hubby and I quit trying to conceive and decided to let nature run its course. I have been drinking like a fish the last week and a half. Wednesday I woke up with a horrible headache that lasted all day, was nauseous and actually threw up. Felt like AF was going to show, but it hasn't. Scared, nervous and excited at the same time! Thoughts?