Prednisone or prednisolone does NOT cause miscarriage. In fact, quite the opposite - it can be used to help prevent miscarriage.
I took 10mg of prednisone up until I was 20 weeks or so, and then reduced it to 5mg, but was never able to get off it completely. It does not cross the placenta so isn't going to effect the baby.
My FS and my rheumatologist were both happy to have me taking prednisone through my pregnancy.
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