new pill affecting my period

i need help! so i haven’t gotten my period since 36 days ago because i started a new birth control and my gynecologist just told me to start taking it when j was the only in the middle of my other pill i stopped and i never got my period. i took multiple pregnancy tests and they all came back neg and i spotted for two days it was light light though should i be concerned if i missed over a month of my period?