I've been on the nuvaring for a over a year and have been having unprotected sex with my boyfriend. Every month my period comes at the exact same time and lasts the same 3 days. The past couple months have been unusual. The month before last my period was late and lasted less than 2 day. Then this past month I took my nuvaring out 5 days after the 3 week period. Now this month I've missed my period all together. I've taken 2 pregnancy tests, both of which came out negative however this week I've been feeling nausea and have been throwing up multiple times throughout the day. Can I be pregnant even if the pregnancy tests come up negative? I'm still using the nuvaring as instructed.