Feeling like crap, am I pregnant?

I'm on Ortho Tri Cyclen Lo, the 28 day pack. I've been on this for almost 6 years. I've read that people can get pregnant on this pill - that it's not unusual at all. I'm worried b/c I received an older pill pack w/ a close expiration date - could it have contained weakened hormones? For the past 2 weeks after my period (today is day 10 after my first day of my last period) I've been feeling really exhausted, w/ light cramping (feels kind of like getting my period) and twinging pains w/ a fluttery stomach. I've also been nauseous as hell in morning and then at random times throughout the day. I have been getting INCREDIBLY dizzy - the only way to make it go away is to lay down with my feet up for about 10-20 min. This happens more and more everyday. Lower back killing me (again like period). My bb's esp. the & aerola look diff (darker?) and they feel fuller/heavier. Pelvic pain (sensitive to touch) & taking lots of naps.Heartburn,indigest. xtreme hunger. It's 2 early 4 test.