Possibly lost the baby.

Just got back from my first ultrasound appointment at what we think is about 8 weeks. I have a longer cycle than normal, so the regular date wheel doesn't really work for me. The scan says the baby is 6 weeks 5 days with no heart beat.  This dating would have put conception even later than we assumed (a very slim chance it seems judging by the days of BDing.) There has been no cramping or bleeding either. I'm supposed to go back for another US in a week. The midwife didn't really want to entertain the idea of a miscarriage at this point, but it's on my mind. I don't even know how I feel right now with this possibility looming. How do I tell my husband?