So I started taking norethindrone for birth control a little over a month ago. I had unprotected sex not realizing that I was ovulating. I panicked and took the plan b pill. I’m supposed to start my period on January 7th (give or take)... now I’m not sure if the sore boobs and lower back pain I have is from my birth control side effects, if I’m premenstrual or if I should worry about being pregnant. I am stressing so much.