My last period ended the 17th of January. I have been on the pill for 3 months and haven't missed a day. I've missed the exact time I've taken it a few days but never a whole day. This week, about 2 more weeks before I start my next period, my breasts have been so sore on the outsides near my armpit. I also noticed some irregularity in my bathroom schedule. I felt more bloated and slightly gassy.