I would say it's possibly coincidental. To make you feel better I am on 25mgs of prednisone and have been since November last year. I will be on it for the entirety of this pregnancy. Prednisone does not cross the placenta and is actually used to ward of autoimmune disease in pregnancy.
I would personally continue on it if it is giving you relief and if you believe that it's causing the spotting. As you know already brown spotting is old blood. It's not unusual to have spotting around the 6-7 week mark and bae completely normal. However, I would suggest seeing your obs as soon as you can for some reassurance and to discuss that doseage.
Dr S uses prednisone to treat NK cells and autoimmune disease in pregnancy with great success (as do other obs). I personally would not be too concerned about the prednisone at all...
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