I'm on nuvaRing and I use it exactly how it should be used. My last period started on 12/25/15 and ended 12/30/15. My boyfriend and I don't use condoms because I'm on birth control but he still pulls out before ejaculating. For the past week I've either been experiencing heartburn and constipation, I read online that that is a sign of pregnancy. I've also read some stories of people still getting pregnant on nuvaring and sometimes still getting their period while pregnant. Should I be worried if I use the nuvaring exactly how it is said to be used. I take it out at the end of the third week at 9pm on a Wednesday and put it back in the same day and time after having my period for the fourth week. I'm just very paranoid about being pregnant and need feedback. Thank you!