When should I see results?

I am 5'3 and 104 pounds I am a 21 year old female and have had one child who is now two. I have a goal to become toned by September first, so about 3 months. I am not worried about losing weight really but shrinking my stomach and toning my butt and thighs. My belly sticks out and looks distended. I hate how it makes me look 4/5 months pregnant. My doctor said nothing is wrong and told me to add probiotics to my diet. I do 30 minutes of pilates a day, 20 minutes of speed walking, 30 minutes on the stair stepper, and 5 repetitions of one minute stomach vaccums. I eat less than 1200 calories a day, maybe less than 1000. I eat fruits, veggies, nuts, eggs, low fat yogurts, cheese, and milk, whole wheat breads, hummus, nothing unhealthy (although sometimes i treat myself). I want 4 inches off of my tummy and 3 off my hips. At the rate I am going (i have been going on three weeks now) when should i see results?? I sont really see any improvements and I am getting very discouraged. Any tips, ideas, input? Thank you!