I've only done Humira 4 weeks now. But the first 4 shots was with the nurse. The exact same thing happen to me. She said it was normal, It was ok. The second week the first shot went fine, but second one did the same thing. If you didn't get the humira in you, you'd know, I did this it went all over my couch! If you still worried about it you can call the humira center where they have live nurse's you cans speak with. I'm not sure if it's the same # for canada and us but I can give you the # for progress center.
UGH! sorry to hear that! Hope it works though.
Good luck, let me know if it you find a difference.