30 day Shred weight gain anyone???

I gained weight also in the first weeks. I do it five days a week so each level is taking me two weeks. This week I lost one pound and then I got on the scale today and it says I lost three more which would be huge (and I am hesitant to even log it until I see it stays for a couple of days)because for the first two weeks I either gained weight or didn't lose any. I was becoming a little put off and I am now starting week two of level two. I am definately getting toned, I didn't take measurements but I can feel it in my clothes fitting and actually see the definition in the mirror. It is intense, like I said I am on technically day 6 I believe of level two and I still struggle on the last minute of strength, I have to put my weights down or I will drop them from being so shaky. lol.