Why am I gaining weight?

I started a new weight loss plan in January and by the end of the month cutting out junk food/soda entirely switching to veg, fruit, and protein, exercising 6 days per week, and just being more active in general, I lost 10 pounds. I was so excited, but now almost 2 weeks into February, I've gained 2 lbs. Like I KNOW this sounds and maybe is a total overreaction, but I'm not sure why I've gained. I've stuck to the same plan as January, this isn't bloating, not stress, and I'm pretty sure I'm too early in the game to have plateaued already especially considering when I started this month, I upped my intensity in exercise just a little bit (increased my walking distance, and upped the poundage of weights I lift).

Any suggestions of things I can do to get back on track or what I might be missing as the reason for the gains?
Why am I gaining weight?
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