My new macbook pro will not recognize my password

I opened my macbook pro 13.3 last nightt for the first time, when I went to shut down it asked for my password. I entered what I thought was the same password I have for my other coomputer. This morning it won't recognize it. I must have made a keystroke error but there is no way to change it. I can't get beyond the user picture, Shouldn't I have a secodn chance, It's very unforgiving.