Ask Health Experts and Get Answers to Your Health Question ASAP
Prednisone does not cross the placenta in high doses and there is no evidence that short term use causes any abnormalities. At 5 months, most of your baby's organs have already formed and so I really would not get worried about this. Stress will increase hormones leading to raised blood pressure.
If you were to continue long term on the steroids then I would suggst a monthly scan to ensure baby continues to put on weight, but for a single course then this is less of a concern.