I've stuck to my diet but i'm gaining weight?

I started the atkins diet and I did great. Started at 136 and droped down to 127. Yesterday morning I was 127 then last night I was 130 Then today im 132. Im not on my period, im not cheating (eating the same thing i've been eating) and I dont think im retaining water cause I didnt exersize and I also took a laxative yesterday so you think I would be losing weight?:(