Twins ? 2 sacs or 1

Jess
Ok so i swear i have a gut feeling im having twins and since u ladies all have exprienced twins or multiples maybe you can help . I keep having dreams of twins and everyone keepa saying im having twins. Even my son, when i ask him if its a boy or girl he says two girls this was at 5wks and 2 days. Next appt is on tuesday i hope i can get a answer lol