Alah, congrats on your pregnancy! At 25 weeks you're already in a good place, honestly, IF (intermittent fasting) and Zumba boleh lagi, tapi since this is your first baby and it's more specific, kena check with your OB dulu to make sure your body can handle the intensity, especially with the fasting part sebab baby pun kena nutrients. A few of my mum friends did light exercise throughout pregnancy tapi they had their doctor's green light, so jangan skip that step ya! Cutting out sweet drinks tu memang bagus, keep going with that.