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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.