I have never been pregnant, and am on birth control pills. My period usually comes on a Wednesday even though my sugar pills start on Sundays. This past week I was suppose to get may period, but I didn't. I had some spotting, but nothing heavy enough to need a tampon, only used Panty liners. I felt bloated and experienced cramps and back pain, similar to what I experience when I'm about to get my period; however still no period. Has anyone experienced this? I am pretty good at ensuring that I take the pill on time, and we use a condom.