Gaining more fat by stopping aerobics?!?

i think your imagining it. if you've been working out two months, there's likely no way you've eaten yourself back to where you were in only week. generally the first losses are water weight anyways, so if you have gained it could be because of the sodium in the food or even your period coming. if you keep at it and keep eating right and drinking water you'll find those pounds will disappear just as quickly as you noticed them creep back.