Scanned too early

Shazzy
Hey all ,  going off my lmp I should be 7 weeks 1 day- i had a internal scan yesterday- she said it was too early to see anything and showed me the sac and said that I need to come back in 2 weeks. 
This is of course going to be the longest 2 weeks ever. Do you think I should be concerned that they couldn't see anything?