"i have been on the nuvaring for a little over a year and really liked it at first. couldn&#039;t notice it once in place and i never had an issue with it slipping out unexpectedly. i used it perfectly and never got pregnant. this month has been different (i.e., midmonth cramps, breast tenderness, lower back pain). i have taken three pregnancy tests, and all have been negative. the one thing that was different was that we used an oil-based lubricant for the first time this month, and in the med info, it says oil-based vaginal medication can increase hormone levels by up to 40%. can&#039;t find any info about the effects of using oil-based lubricant with nuvaring, so be careful about that! "