Well, if you are seeing light through the lens at every speed, then the light was reaching the film and every frame should have received some kind of exposure. Thus, none should be blank -- unless you left the lens cap on.
Still, that thing about all the camera shake and the shutter being visibly slow to come back when set on B indicates that you certainly do have a sticky shutter. If it isn't too bad, then it will come and go. Later it will become significantly slower on all speeds and then it will finally lock up solid. I'd still get a CLA. It is possible that your shutter curtains need retensioning too. A lot of bad tinkerers add curtain tension to FSU cameras once the shutter starts showing signs of becoming sticky, in order to put off getting the thing serviced. This gives them only one shutter speed that is more or less accurate, with all the others performing erratically though. It makes the repairman's job tougher too, since once the inevitable CLA is done, now another adjustment has to be made.