6+6 week Ultrasound

I had my first prenantal visit yesterday and my doctor did an ultrasound. I'm estimated to be exactly 7 weeks today (so 6+6 weeks yesterday). We could see the sac mostly clearly but he said that he wasn't able to get a clear image of baby. He did say that everything was looking good and he could see where baby was but in the process of finding baby the image kept getting too fuzzy to really be able to capture it. Doc said my hCG levels looked great and everything looked really good but I'm still a little worried because I had some slightly concerning spotting last week and after my chemical in July its hard to get my hopes up. I did just give a urine sample before the ultrasound and I know that an empty bladder can contribute to a fuzzy image so I'm trying to just keep telling myself that. My next appointment is scheduled for the 30th (even though I told the receptionist that my doctor said he'd see me BEFORE Christmas) but I'm thinking of rescheduling for sooner just to try and ease my mind a bit.