I am so discouraged

6 months PP, 3 weeks into dieting. I am doing intermittent fasting+low carb diet+working out. I dont know what the fuck is wrong with my body. Its refusing to drop any pounds. I was getting healthier before I got pregnant so I was around 170, I was 220 when I had the baby and now I'm at 225. Ive been going for 3 weeks, Im counting calories and Im just so fed up by this body that wont respond! Grrrr! Tell me this will get better. I just want to cry.