Not losing weight on brith control

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I've been eating reasonably well and working out since march this year and in May I lost 4-5kg, since then I haven't lost any weight and gained back 3kg.
I was on depo but recently I switched to a pill, maybe nova? Can't remember the exact name
But even if I do count calories or I don't I'm just not losing any weight
I'm pushing myself in the gym and working insanely hard but I'm just not losing any weight
Any ideas?