Subtotaldog

I recently changed my name and password then I had the urge to play this launcher I have had this downloading and played it before the name change too. I was wondering if that affects anything because when I try to login into the launcher it tells me I put in the username or password wrong, I know I didn't because I logged out of my minecraft account and logged in and used the exact same username and password with no mess ups. If anybody can help me thanks I have had this problem for 3 days now trying to figure it out but sadly no luck, this is my first post I need help with and hopefully my last. Thank you for taking the time to read this.