The Doctor did manage to contain himself from leaping immediately to Friday to make sure he wasn't late for his outing with Martha. He did not, however, wait the entire week. He waited a sum total of 45 hours before he hopped in a clean suit and zipped back to Cardiff to pick up his companion. Former companion. Martha. She didn't have to be anything but Martha.
He thought about getting flowers, but decided that might give the wrong impression.
Last thing he wanted to do was give the wrong impression.
Instead, he just pulled up the TARDIS near the hub and stood outside, waiting for her to finish up and arrive out.