Quite normal but you should now start to improve. Doesn't hurt to talk with oncologist or GP if no improvement at all in 2 weeks. Possibly you are anaemic or thyroid is out. Simple blood test can check that out. It was about 7 weeks before I was on the improve but I tired quickly. I went back to work for 4 hours a day then home and slept for an hour. For me it took 6 months to recover. I kept trying though and used to do regular short walks to improve my exercise tolerance also.