So about 2weeks ago I missed 1 day of my birth control pills so the following day I took 2 pills. Then again I missed a day and again the following day I took 2 pills. I then had unprotected sex, and for the last past week I have been noticing symptoms. Lower backaches, gas, heartburn, stomachaches, headaches, and a little bit of some nausea. I dont know if these are side effects from missing days or if I am pregnant. I need help!!