Are you taking your measurements as well as your scale-weight? Sometimes we lose inches on weeks where there's no weight loss. Measure everywhere, like arms, thighs, calves, bust, waist, abdomen, hips... You're only 8lbs heavier than you were pre-pregnancy, which for most people is more than acceptable! It could be muscle-weight too, as you've been working out a lot. As long as you're at a healthy BMI, I wouldn't stress about the last few lbs; just focus on staying active and enjoying life, and implement some of the suggestions outlined by the MD above.
If you are aiming at losing weight, it is important to calculate your current BMI and the target BMI. The target BMI should be in a healthy range. Aside indulging in moderate amounts of physical exercise it is also essential to maintain a healthy diet plan. It is important to know that a diet plan is not about cutting down calories; it’s about ‘healthy’ eating. With cutting on diet one may initially lose weight but this may remain static or increase later. When one cuts down on calories, the body sends a signal to the brain which in turn turns on the ‘stress hormones’ and the body switches into the ‘starvation mode’ and paradoxically one may notice no change in weight or an increased weight. One would need adequate amount of calories to support the basic metabolic functions and if you work out vigorously, your required calorie intake rises. A healthy diet should consist of adequate amounts of carbohydrates, proteins, fat and plenty of fruits and vegetables to supply vitamins and minerals. Start with a healthy breakfast, moderate lunch and light dinner. I would also suggest a change in your exercise regimen. You may rotate between a gym, swimming, yoga, aerobics, jogging, cycling etc. Also keep a track of calorie intake and your work out. With gradual consistent efforts, you should be able to lose weight as desired in a healthy way.
Hope this helps.