THe other night, when you mention this in your journal, i did a bit of surfing research (i KNOW, i'm a big GEEK! LOL). All i could find was that prednisone is known to cause menstrual irregularities and that for some women with autoimmune problems (especially those with elevated Killer Cells) prednisone is prescribed along with an anticoagulant to protect the pregnancy, usually for the first 12 weeks, but sometimes for the whole pregnancy.
I just googled "prednisone, pregnancy, spotting" and a whole lot came up. I can provide links by PM if you want.
From the things i read i would think that it's possible the prednisone is doing something to your hormone levels, and that reducing is making you spot. I wouldn't assume that it's "protecting" the pregnancy, more that the level dropping is making you spot a little but that the pregnancy isn't in danger during these times, especially is it's old blood.
Either way if your rheumy is happy with you on prednisone and you are happier on it, then i would continue on 10mg until 12 weeks and then, IF you want to, see if a reduction in dose can be done without spotting.
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