Hey Jen, i got my hernia with my last pregnancy at 20 weeks, and was told it would go away too. it didnt, and now it is getting bigger all the time too.
There is not much they can do to help it though, but mine does get realy sore if i do too much bending and lifting. I am actually going to see if they can repair it at the same time as they do the c-section this time, just not sure if they actually can or not??