every woman who gets pregnant and gaining excess weight is normal and you don't need to be so much worried on that. consult your doctor at times you really need to shed some pounds when needed.
practice healthy eating diet and not by starving or skipping meals. everything depends on how you take care of yourself and how you handle food that are unhealthy for you. if you are unsure of what you eat, you can always ask a professional's advice especially when you are pregnant.
It's very normal to gain weight during pregnancy. Just try to be very careful on the foods you eat. After giving birth to your baby, you may continue having exercise and dieting.