First of all pulling out is not a safe form of birth control. Also taking medicine can screw up your birth control. Take a pregnancy test or get one at a pregnancy center.
I am on birth control and on antibiotics for strep throat. I had sex, he didn't pull out. I started spotting brownish pink 5 days after for 1 1/2 weeks. nauseous in the morning and during the day,back pain and headaches frequently along with fatigue?