Hey mama, don't worry too much but also don't ignore it, at 28 weeks, some variation in movement is normal as baby is growing bigger and has less room to do those big kicks, and things like your diet, activity level, or even baby's sleep cycles can affect how much you feel. That said, I've heard that the real thing to watch is your baby's pattern, if it feels noticeably different from what your baby normally does, that's when you want to pay attention, because sometimes reduced movement can point to cord or placental issues that are worth ruling out. A friend of mine actually went to the hospital just to be safe when she felt her baby was quieter than usual, and she said the doctors were really glad she came in rather than waiting it out. So if your gut is telling you something feels off, please just head to your gynae or even the KKH/NUH A&E, they won't judge you at all for checking, and it's always better to be sure! Do check with your own doctor since every pregnancy is different and they know your history best.