Aspiring Fit Momma

So....I've been working my tail off. Abs, yoga, weight training, running.....and lately I have been seeing a weight gain! What gives?! I am trying to not just go by the scale....I have been measuring myself too. And on that end I am losing! My abs have tightened up quite a bit...which was my goal. But, I have also set another goal in terms of my weight and I was getting close....now it is going the other way! Which is really irritating me! Maybe I have become a little scale obsessed....I mean, I look good....feel good....I am toning and gaining lots of strength. So, why is that that number get sooooo under my skin.