Uy, first-time mommy anxiety is real, and I hear you! Pero since you already saw your doctor and baby's heartbeat is strong (that 147bpm is so reassuring!), trust their guidance with the Duphaston and bed rest, maraming kaibigan ko na naka-experience ng brown spotting early on, at nag-continue ang pregnancy nila successfully. The fact na may heartbeat na agad ang baby ay very good sign talaga. Keep taking it easy, stay hydrated, at don't hesitate to call your OB anytime if anything changes or you feel worried, that's what they're there for, especially for first-time moms like you. Kaya mo yan!