All morning I have been experiencing what I can only describe as "muscle twitches" in my right rib area... can this be the baby kicking? Can she kick up that high already?
I've never had muscle twitches before in any other area of my body other than my eye...  
I have anterior placenta, so thus far-- all movement has been very light and muted.
Re: Kicking in the ribs?
On Sunday, it felt like someone was trying to separate my rib cage from the inside out, so I'm no doctor but I'd say it's possible!
(I have an AP as well, but I'm not sure it's relevant.)
Mine decided to take residence on my left side for about a month. I felt him in my lower left side and when I had my 15w U/S the tech told me it was the head. LOL
Same thing, I've been feeling kicks in my ribs. I'm hoping he runs out of space and moves to the center soon.
I am definitely not as far as you but I've been feeling this as well since about 3 days ago. I feel it more just under my boobs. I didn't think it was possible to be the baby yet so I wondered what it was. I had to go for a redo of my a/s yesterday since she was moving too much the first time. I asked the tech about it. Her head was resting on my bladder but her legs were extending way past my belly button but not quite at my ribs. So I think what I've been feeling is the effects of her kicking my organs that are just below my ribs.
I have an anterior placenta and I am 5 feet tall with a super short torso.
Baby girl born July 6th 2012 at 40w2d