Pregnant or side effects? Am sexually active, and have nausea, dizziness, etc. On mononessa, faithful taker, every night at 10, never missed.2nd inactive pill

Maybe. You are pregnant until proven otherwise- get a serum pregnancy test- if negative, call your physician if these symptoms worsen or are unresolved. Remember, if you are sexually active at age 16, you are under the age of legal consent in many states. I would strongly recommend no sexual activity until you are married. To do otherwise only sets you up for a boat-load of trouble.