Uy, totally normal yan mama! A few of us pregnant moms noticed the same thing, hiccups in the womb happen kasi baby is practicing breathing and swallowing na, so don't worry. It's actually a good sign na buhay at active ang baby mo, at marami sa amin na naranasan yan around 28 weeks more or less, so you're right on schedule. Just enjoy observing those little movements, it's one of the sweetest parts ng pregnancy na yan!