Don't know how to feel!! Help..

Nicole
Okay here we go. First day of LMP was 6/22, it was the first after a miscarriage. I missed my period around 7/21 and didn't get a positive test until 7/29. I'm supposed to be 7 1/2 weeks today but I went in for ultrasound and I'm measuring 6 weeks and there was just a sac in there. They said since I had a miscarriage my cycle could have been off but it could not be developing either...it could go either way. What do you guys think? I'm trying to stay optimistic, if I ovulated on the 13th of July does this make sense?