hi welcome to hcm.see its not that if you had first child on c-section then second on like that it may be possibilities of normal child.there are no such a pills to support you .you do exercise and yoga
which help you in your plan.plus drink plenty of fluid ,all green leafy veg to become healthy which is necessary for it. its your personal matter but i suggest maximum carry 3 to 4 child more multiple birth there are risk increase for both mother and child and also you may suffer from prolapse of uterus
in future so plan your pregnancy
in advice with your gynec or any health care taker.