Las Vegas!

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I am so annoyed with myself, joined my fitness pal a month ago but have hardly used it!! Every day I find an excuse to start the next day (work/birthday/weekend away!) but it never happens!
I've got three weeks before I go to Las Vegas with my super skinny friends and I'm dreading it now! Going to stick with it now until I go but not sure how much difference that will make now! Have I left it too late?! Don't know but I'm going to give it my best shot!