Possible twin?

Due date according to LMP (12/27 and positive ovulation is 10/4.

However I went in today for an early scan and they believe due date should be 9/30 based off gestational sac size being 6 weeks exactly. At first the tech said she thought she saw two yolks in the sac, then settled on one measuring at 5w5d.

1 go back in 2 weeks for another scan. how many do you see?