Irregular shaped sac?

Christie
My first appointment showed a teardrop/elongated sac. The doctors asked that I come back in a week so they can keep an eye on it. I'm paranoid because I had a blighted ovum in December. Is there anyone else out there where this has happened to them? On top of this, the heart beat was on the lower end. I measured at 7weeks5days with a heart beat of 111bpm
Thanks in advance for your input and support!