Coming off birth control symptoms?

Patient: I recently took birth control (microgestin) for a month but stopped right when i got to the brown pills. i had unprotected sex on the 20th of october and stopped taking the pill on the 21st well a week and a half ago i had really dark brown blood that was not heavy like my normal period and lasted 4 days if that. i have been super nauseous but dont throw up, and had no appeitite and just today i got really short of breath walking to the store. is these symptoms of coming off the birth control?

Symptoms: Nausea, sob, headache, lower back pain. fatigue