Firstly, not all birth controls cause weight gain.
If you are taking/using one that will cause weight gain for you, then gain could start at any time. Usually though you see the weight going up soon after you start taking it, and it gradually goes up.
Hi Tariah! Birth control pills are taken every day and don't cause any weight gain. My friend got the Birth control that was put into her arm and she gained about 20 pounds the first month. The birth control shots may make you gain a couple pounds. If you are scared about gaining weight get the regular birth control pill.
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