Does anyone else besides me have probles to log in?

I was on my laptop finishing a chapter and when I was about to log in to update it tells me that my user name or password is invalid. I tried to log out from my tablet and then log in but it says the same thing and now the only place I still get into my account is by my cellphone. Is this only happening to me or is a aff problem? what do I do? can some one help me please??? D;