The pediatric will have a better answer to the medicine. I can suggest few tips only. Make sure you change his/her diapers every 2 - 3 hours even if she doesn't spoil them much for the first few weeks. Make sure when he/she does potty change it immediately and not wait for the diapers to get heavy because the components present in the potty along with the urine cause a threat to the baby's health. Try using cloth diapers until the baby has cured from the disease. Clean his/her bottom with cotton and water instead of wet wipes. Though the companies say they are alcohol free they still contain a tiny amount of it. And even if u would like to use, then wash it with water before using it for wiping.
Medicine during pregnancy should be avoided, add curd and have 5 Liters of water a day... This may help
Please talk to your doctor. In the mean time, use cloth diaper.