Why did this happen to my body?

ive been trying to shed a few pounds, so ive been eatin about 1300 calories-1500, and burning 200-250 every dya. i weighed myself, i lost like a pound or two, but when i looked at my tummy in the mirror it looked BIGGER. like buigger than it was before!!!
i dont understand, im eating healthy lunch dinner, and breakfast and drinking tons of water!!
at first, (this morning) i thought it was water, but then i never peed it out! :(:(:(:(

so what went wrong?
please anwser! thank you:)