I have been inspired by RW articles on women running during pregnancy and am determined to follow in their footsteps myself (providing I am well enough to do this of course). However, all the books & magazines I read repeat how you mustn't let your pulse rate increase to more than 140 or get out of breath etc etc. I am used to running 7 1/2 min miles and marathon training. This seems incredibly slow, I'm convinced some peoples 'level of exhaustion' is my feeling 'a bit tired'. I'm still in the 1st trimester, if I feel fine is it to run as normal?