and I just noticed yesterday that there are a few spots on my belly (near belly button) where the skin is numb to the touch.. anyone else have this? 

Yes my surgeon said that is normal. Those muscles are still mending healing. I went through the same thing until about wk 5. I have full feeling now.

 Hi I'm four weeks post up and I  have that problem too

Normal. I had ACL surgery in 2003 and there's still a spot on my shin that's numb.