My 10 week old went 3 whole days with no accidents in the house. I knew he wasn't potty trained yet, but I saw light at the end of the tunnel. On day 4 he had a couple of pee accidents, but I take full blame (which of course I know I should

) because he tried telling me, but I didn't think he was trying to say he had to go out.
Well, today is day 5 and it's like he was starting over again! I mean, he was peeing everywhere! Nothing has changed as far as his schedule so I don't get it. We took him out about every 15 minutes and he still went in the house.
The only thing that's different is he went to the vet yesterday for his second set of shots. Could that have anything to do with it??? He's really whiny too, today. We can't figure it out. He's not hungry (he's eating), he doesn't have to go out, he's been out to play and we played with him inside, but he's whining like he needs something and we can't figure it out.
Any thoughts?