Have any of you ladies either run or trained for a marathon while pregnant? I ran the RNR San Diego only about four weeks pregnant, and am training to run the MCM this year.  The first trimester was rougher than it had been for my first, and I missed several marathons and halfs that I'd planned on running. I'll just be starting into my third trimester for the MCM- and I've read of other runners that have completed these events successfully. Any tips? I could definitely could use some!