Belly Buttons

Just real quick.  It's a well known fact (well known to those who have been pregnant or randomly read pregnancy books) that eventually a pregnant woman's belly gets so big that her normal "inny" belly button pops out to an "outy" - perhaps due to lack of room?  

My concern is this.  My belly button already seems to be popping out.  Isn't this very early?  I can also now perform a bit of a party trick where I can move the inner button around in circles, which I think is pretty neat, but I believe Ben's response was, "Gross."  He thinks we should ask the doctor if our baby is growing at some way too fast a rate for these things to be occurring.  I may just be gestating an elephant in there.