I have been on the pill for several years. My last period was June 23. I missed a week between packs of birth control because my prescription expired, but resumed taking it July 3. My partner and I had sex on July 2,3, and 4. We used a condom each time and there was no contraceptive failure to my knowledge about nine days ago I began experiencing very bad breast tenderness, on the top of the breast toward the armpit, gas, and twitches in my abdomen. I have taken four pregnancy tests- 12, 13, and 14 days past ovulation. All were negative, though one showed what i think was an evaporation line (12 dpo). My period won't come until next week, since I delayed my cycle by missing one week of birth control. What could be causing these symptoms?
If it helps, I started taking Doryx on the 14th of July. Also, my doctor suspects I have some form of arthritis (probably rheumatoid as my family has a history of it) which will be confirmed at an appointment in two weeks. Do either of those contribute to my symptoms? If not, what does?