Hindi ka nag-iisa, sis! A few of us first-time moms felt the same thing around 22 weeks, parang butterfly lang or gas bubbles talaga, especially kung first pregnancy mo. Since okay naman sabi ng OB mo and the heartbeat is strong, you're probably all good na; some moms just feel the kicks later or lighter, lalo na if the placenta is in front (anterior placenta yan tawag). By next month or so, magiging mas obvious na talaga ang movements mo, kaya just relax and enjoy monitoring it, but if you're worried talaga or suddenly walang movement in the coming weeks, better to check back with your OB para ma-ease your mind.