Irregular periods

I used to have a normal period, came at the same time every month. Now, I rarely get it and idk why. I was a heavy drinker for about 2 years & gained I would say 50-60 pounds within a year...maybe that could have something to do with it. But I went 3 months without getting my period then I started working out, stopped drinking & got my period, now next month comes & it hasn’t come! I’ve lost 15 pounds now that I’ve been sober & I workout on a regular basis. Idk I’m thinking I should go back on birth control. Been off it for like 2-3 years now. regardless of how much I hate getting my

period I weirdly miss getting it monthly. Makes me feel not normal. 🤔😅