Going to the doctor

Okay so im 19 and this would be my first doctors appointment since last year....I was on birth control to regulate my period but me and my bf decied to ttc so i stopped taking it my period was still out of whack and i havent had one since april 2016....I wanted to discuss somthing about regulate my period but not bc....Im kinda on the chunky side so would she reccomend loosing weight before disscussing that ? Or would she just make me get bloodwork to see if i have PCOS or anything?