Any info on a blighted ovulum, I just found out through an ultrasound.?

I had an ultrasound done yesterday I was 12 weeks. The doctor said there was a sack but no baby had formed inside so I would miscarry or get a dnc. Does anyone know info on a blighted ovulum? Did it affect your chance of getting pregnant again? How soon after this were you able to try to get pregnant again? thanks.