Sayang, movement can vary throughout the day, but if you're noticing a real drop from her usual pattern, better check with your doctor just to be safe, they can do a quick scan to make sure baby is okay. A few of my mum friends noticed their babies were less active during certain times, but we all got checked anyway sebab peace of mind is worth it, kan? Don't worry, usually semua fine, but at 30 weeks it's best not to guess-guess.