Yes I call it "empty Belly syndrome " haha
I felt the same way. But this pregnancy has been a whole lot different then the first. I get more pain now then I did with my first boy and it's not as easy as my first one was.
That's normal. I felt like that after my 1st pregnancy. We were trying to get pregnant again, then decided to just wait ... and then BAM!! Pregnant again!! Congrats on your bundle!! :-)