Of course Britney looked downcast and subdued, nobody enjoys going to the doctor(especially in the a.m.).
I doubt it is anything dire or controversial since many doctors have offices inside a hospital. It was probably just a routine checkup before her tour. Britney probably had to go to the hospital for tests to make sure her heart didn't have any problems that could cause her to die (like how young athletes die of undiagnosed heart murmurs/defects). The media spin suggests that she got an abortion ,but i don't think she did. If she wanted an abortion she could have snuck into a clinic during off hours and i doubt seriously that she would have done it in broad daylight like that. And you certainly wouldn't feel well enough to go shopping afterwards. LOL