yeah thats what i thought but a year ago i fell on and gad a early scan around 7 weeks and they thought i was gaving twins and i was showing really early but sadly i never got to find out as i lost a few days later...
Go to an Ob. He might tell you what to be done. Also from the 10th to 13th week they will do a dating scan to tell your due date.
I doubt you'd show so quickly most likely bloated. Just make a doctors appointment they will tell you