A question

Hello fellow mommies.

I have a quick question to ask you all:

My daughter (26 months) has been throwing up quite a bit, lately.  And she's not sick.  I have noticed that she tends to throw up if she hasn't pooped the day before (she's usually VERY regular, but has her 'off' days).  It seems to me that her tummy can either handle pushing out the poop or throwing up the food she recently ate.  Poor little thing, today she started to cry, told me, "I don't want to throw up!"  then threw up on the couch.  She feels better afterwards, eats just fine...and usually poops within the next 3 hours or so.

I guess my question is, is this something I should be concerned enough about to consult a GI or her pediatrician (we happen to have a fabulous pediatric GI that my son goes to....)?

Thanks for any help or advice!