no baby or heartbeat at 6-7 wks? miscarriage?

mmcgarrity

We went in for an u/s thinking I was around 7 wks. No baby, no heart beat.  The doctor said based on my last period I should be 8 wks, but I had very irregular cycles (34, 49,32 day cycles) so I could be a few wks behind on the calculations.  I got blood tests for HCG and I'll know Monday and I go back in a week for another u/s, but she said it did not look good.  She said it could possibly be a blighted ovum.  I'm so heart broken.  Is it even worth keeping hope for this next u/s?  Is it possible to not see a baby at 7 wks?  I got a pos pregnancy test 3 1/2 wks ago so I'm guessing I would have to be at least 6-7 wks along.  I'm confused and worried.  Any advice or comments from anyone who has been thru this?  Thanks again for all the support and feedback.