First ultrasound and I'm sad

Danielle
So I am 6weeks and 6days today and we went for the first ultrasound and he found two sacs one of which he couldn't see anything and the other we saw the heartbeat but only 113 bpm and baby is measuring 6weeks 1 day. Now he is saying threatened miscarriage. Im so upset. Has anyone else delt with this and baby gone on to be healthy?