It doesn't feel like heart burn though. It's not a burning feeling :(
Try to take some tums just in case and see if it does anything for you, i had the same problem around week 20-something. It went away though. If it gets too severe call your doc, or id just ask at the next appointment if they know what might be causing it.
But not everyone feels burning with heartburn. Sometimes it just feels like chest pains, especially if u are feeling them when u bend over.