If you didn't play contact sports, do jetskiing, etc before you were pg then obviously it would not be wise to start them up while pg! But if you did play sport or do other exercise beforehand then it is ok to continue, or maybe continue but take it a bit easier. My sister has always worked with horses, ridden horses, been in comps and all that and when she was pg she continued to ride as her doctor told her it was ok. Obviously she took it easy and didn't take any unnecessary risks. Myself, I have never been sporty or horsy so I don't do these things while pg either!

I am not sure about the m/c thing - I have read of instances where m/c has been caused by something, usually out of the mother's control, like a car accident or being injured, but then of course there are the cases where there is no reason - it just happens. I will always worry in the back of my head about it happening, can't help it even though it has not happened to me before, but at the same time I do not want to wrap myself up in cotton wool either.