Possible kaya na mali lang yung lumalabas na result ng ultrasound saying na walang heartbeat?

Weird kasi ng ganap ko today. Nag pa ultrasound muna kami sa portable ultrasound tas may nadedetect pang 80-90 na heartbeat pero nung nag trans-v na, saka naman walang heartbeat. Hoping parin kasi ko na baka mali lang. Twins pa naman both no cardiac activity.