Only 4 weeks along & twins?

Shelby • Expecting baby number 2!
Excuse  the people in the back ground but I'm 4 weeks along and when someone askes how far along I am they are surprised that I'm only 4 weeks along, and says that I'm having twins! And I have had ALOT of people telling me in having twins. I haven't been to a doctor yet but my appointment is coming up soon what do y'all think?!