Totally normal lah, don't worry! A few of us still had nausea at 25 weeks, especially on certain days, some mums swear it's triggered by smells, what they eat, or even being tired. The on-off pattern is actually quite common; it's not like first trimester where it's relentless every single day, so that's a good sign. Pening dengan nausea together memang exhausting, I get it, make sure you're eating small meals, staying hydrated, and resting when you can. If it gets worse or you're not keeping food down, best to check with your doctor just to be safe, tapi most likely it'll improve soon! Hang in there!