Earlier this year i had to go to the gyno because i didnt get my period for 2 months so they gave me 10 pills to take and then when my period came i took birth control for 1 month. So i started having a period every month for 4 months These are the days june 13th july 7th august 4th and sept 7th.. & i havnt got it after that i took 2 pregnancy testes just to make sure & they were negative what should i do? Im not stressin or under weight ive had the same sex partner for 5 years so i know i dont have anything. Please help

Go back to the Doctor and get tested for a variety of things from hormonal level to general health.