Anak, I know how scary na feeling yan, first time moms, we worry so much! Please go back to your OB as soon as possible para ma-check ulit properly, or if you're really worried, go to the hospital today. At 22 weeks, dapat madaling mahanap ang heartbeat, so kailangan talaga sila mag-investigate properly para ma-ease your mind. Sometimes it's just the position ng baby or technical stuff, but only your doctor can check you thoroughly, hindi ako. What I can tell you is, you feeling movement is a good sign, and folic acid ay important throughout pregnancy so take it as prescribed. But please don't wait, mama, go back to your OB today or tomorrow. You deserve proper reassurance, hindi lang "mahirap mahanap."