To tell husband now or wait??

So I have recently found out I’m pregnant again. We just had our 4th miscarriage 3 Months ago. So every time I have found out I’m pregnant it’s not a happy time anymore it’s a huge worry and my husband worry’s the most. Each time it is turned more dangerous for me. I am a little over 5 weeks now and go for an ultrasound in two weeks. Because of my history I need to stay as calm and positive as possible right? My dilemma is do I tell my husband now or wait till the scary part is over? There is positive and negative either way and I am indecisive. If I wait and the ultrasound shows a baby and heart beat he’s going to be upset he didn’t go. If I tell him now he’s going to be scared and worried for the next two weeks. What do I do? I need others feedback on this to make my decision?