Firstly- make sure there is a gap of 2- 3 years between first and second delivery. It helps your body to cope up well from last delivery.
Later - plan for pregnancy after making sure all your blood parameter are normal such as rbs, hb and
thyroid profile . If the above parameters r normal.. there are less chance of risks in your case. If you are planning pregnancy there are certain drugs to be avoided which cause harm to baby . Consult a gynecologist and discuss .