Yes i had some intense cramping in the begining it doesnt sound out of the ordinary but if you are really worried go see your doc to check you over and get some peace of mind..as for not showing yet i wouldnt worry about that at all..regardless of your build your baby at this stage is barely the size of peanut so its not likely you would show at all yet
Cramping with no bleeding is totally normal, your only 4 weeks Way to early to be showing, don't stress over that. If your still concerned about the cramping, contact your ob.
I have cramping on my left side that can be pretty intense but everything I read says it's not a problem unless you start bleeding. Congrats Mommy and good luck!