Hi there...congratulations on your pregnancy. Try to eat healthy foods rich in proteins and fibres like pulses, green leafy vegetables, fruits, egg white. Fibres content will help prevent constipation. Also try to avoid too many sweets and hight salty foods to prevent any signs of gestational diabetes and ecclampsia. Also take your iron and folic acid tablets as prescribed by your obstetrician. If your feeling very tired then you can get your haemoglobin checked, as to commonly deficient among Indian women. But it is best to consult a obstetrician and dietician personally so that they can examine you and provide you with a chart regarding diet.