Did you try all the tricks - like drinking OJ and laying down for awhile afterwards?
Maybe she is in a different position (like, her feet are towards your back so you can't feel them as much), or just sleepy.
But honestly, if you are worried I would call for peace of mind.
sherpa:Calling is not going to hurt anything, it's what you're paying your doctor for anyway.
This. Sometimes I bug the h*ll outta my doc.