8 week scan

Shell
After I had a mc in oct 15 I fell pregnant again this Feb which makes me 8 weeks pregnant now, 
I am 41 and am feeling very worried I might mc again so to put my mind at rest I booked a private scan which I had last Saturday, 
At the scan they saw a healthy sac measuring just under the 8 weeks but no Feral pole, they have told me to come back in 10 days to re scan and try not to worrie :( 
This has understandably mad me feel a whole lot worse and was wondering if this has happened to anyone else and what was the outcome ?