I can see both sides of it your motherly instinct to protect your child and your doctors reasoning for wanting to protect you...the patient, because until the baby is born or ready to be born you are the patient and the one they are in charge of carrying for. Your age (NOT that you are old, just at the higher risk age), the pacemaker and the placenta previa are all negative risk factors. Babies can be born now so early and survive. A child born at 36 weeks can be perfectly healthy and go home in just days after birth. Talk to your doctor, try to be calm and ask questions. You have to think of not only your baby, but your health as well. It does no good to grow this healthy child to have you suffer a problem during delivery. Ask your doc what the potential risk factors are of waiting and the benefits of delivery early are. If the risks are so great that you need to delivery early for the benefit of you and your child then I think you will know what to do. Good luck, we'll be praying for you and your baby!