anybody ever find out they are pregnant but they are on their period and on birth control?

I am on the nuva ring (have been for 8 months) and using it correctly. My period started Tuesday and I have had the worst headaches, nauseas during the night, morning, and afternoon and horrible cramps that come and go. I eat like a ravenous starving animal!! I know it probably is impossible but I swear if I wasn't on my period and birth control I would swear I am pregnant.