hi, you may have ovulated or implanted really late..
the last scan showed you are 5weeks-1day, which is too early to see a heartbeat..
Its easier said than done, but please try to relax as worry causes more complications..
Your doctor is correct in asking you to come back in 7 days.. so at 6weeks-1day you should be able to see a sac and yolk sac.
Good Luck..
I have been through something similar to this, I went for an ultrasound at 6 weeks and they found there was no contents they thought I was only 4 weeks or so, I went back a week later and again there was nothing, they sent me home again and this time I had to wait 10 days for another ultrasound. In the meantime I was having regular blood taken and my hcg was rising. I finally went back and there was no contents. They diagnosed me with a blighted ovum, where the fertilised egg didnt grow but my body still thought it was growing a baby. I had to have a d&c a few days later. It is till possible that you can be very early for them not to detect anything though. If there is no contents still on your next scan I would demand another scan a week after as they do make mistakes with your dates. i really wish you all the best and fingers crossed it works out for you.
I had the same thing happen, I went for many ultrasounds because we were unable to find the baby...we only found the sac....I had too suffered a blighted ovum 4 months earlier and miscarried naturally...Different story, sorry.\
Anyhow, I went many times and it wasnt until I was 8.5 weeks that I seen our baby...we were bumped up half a week aswell. Crazy how we couldnt find her and then when we did she was bigger than her actual gest age. She is now nearly 8 months old.
There are a few other ladies that have had early ultrasounds where nothing was visable and then went back to find baby. Don't loose hope and try not to stress to much.
Best of luck
thaknx to all.......for comment....