Anak, I know how scary this is, I remember my kaibigan going through the same thing, and the waiting was the hardest part. But please listen to your OB and go back for follow-up scans as scheduled; sometimes the heartbeat just takes a bit longer to show up, and that's okay. I've heard success stories from a few of us mums where everything turned out fine after that worry, pero ang importante talaga ay regular check-ups with your doctor, hindi lang pag-antay. Mag-pray ka, take care of yourself, and try not to google everything (alam ko, mahirap!). Kaya mo yan, marami sa atin ang nag-worry sa simula pero okay ang mga babies namin.