Can birth control mess up my ZC diet and weight?

Sorry for mistakes, but I’m Italian. So I’m 21 and I’ve been gaining and losing 10 pounds for years. Then I went keto, because it made me feel better in general, but I was bloated all the time as I was eating huge amounts of vegetables like broccoli and spinach. I decided to try ZC(1,5 months so far). A few days passed and the bloating was gone. My problem is that 2 months ago I started taking birth control for pcos(the only “treatment” the doctor will offer..) and I didnt have the big zero carb increase in hunger some people report, but I’m gaining weight. I don’t count calories and practice intuitive eating. It worked fine before BC without weight gain. Out of curiosity I counted everything I ate yesterday(i was full because I eat very fatty meat) and it was 1400 calories so not enough for me to gain weight. Could it be because of birth control?

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