I agree with you and everyone else. I wanted to at least venture a guess for her since she's posted on here and curlynikki asking people's opinions and seems to really want to know.
To the OP: Personally the size of the curl really isn't important. You'll certainly know what the size is when/if you BC. Just do everything can to baby and nourish those roots. If they are 4b like they look like they'll be to me I'm sure they'll be beautiful. If they end up 3b or c or whatever they'll be likewise beautiful! Good luck and enjoy your hair!
On my EVO