nervous mommy to be

So I've had two miscarriages in the past two years. I'm now pregnant again (5w3d) and I went in for my first ultrasound today. We could see the gestational sac but nothing else. The technician says that it's perfectly normal because the baby is too small to see. However I'm so worried and scared that this pregnancy will end up like my last two, as a blighted ovum. I'm just praying for a healthy rainbow baby.