Heartbeat...

Ok, so I'm 9+3 weeks along. At exactly 9 weeks, 9+1, and 9+2 I heard the baby's heartbeat on my home Doppler. Really early, I know. I was shocked I even found it at 9 weeks. Anyway, I've heard it the past 3 days nice and strong. Only took a few minutes to find. Today however, I've been trying literally for 3 hours and nothing. I can't find it. I got the Doppler hoping to ease my mind about miscarriage and keeping tabs on the little one. But now the opposite. I've been hysterical the last hour. I'm seriously freaking out. I hope my baby isn't dead. I'm beside myself with worry. ?