Hindi pa talaga, mama, usually doctors recommend waiting til 12 weeks pa lang para mas clear ang heartbeat with doppler, kaya mas safe at mas accurate. A few of my mum friends tried getting one early at nahirapan lang makita ng consistent reading, so mas okay talaga pag nilabas na ng OB mo, especially if you have your dating scan coming up soon anyway! Best to chat with your doctor about this one, they might do a trans-vaginal ultrasound at 10 weeks if kailangan nila talaga makita ng details, pero fetal doppler specifically ay mas standard sa 12 weeks onwards na.