Hello! Congrats and welcome!
My twins were also supposed to be our last "one" and ended up with two. LOL So fun! I have three older boys, so I know the "thinking pink" sensation!! Hoping with you!
The ladies are right in that you can't know for sure until you know genders, but you (and probably the doc said) are also right in that it's more likely that they're fraternal. If they're the same gender you may never know though!
THinking pink for you and hope to see you often!