Hi there, I agree with Lieren...you can chart your cycles and figure out pretty easily if you are ovulating and if you have a normal length luteal phase. One certainly can get pregnant while running a great deal; I'm 23 weeks pregnant now...I got pregnant in the height of training for Boston and I was running 65 - 70 mpw.

But perhaps you could ask your doc if she was referrring specifically about luteal phase defects or if there are other issues regarding exercise and conception. It does seem like low body fat as a result of running can correspond with hormonal problems in some women and this would certainly affect ovulation/conception...but if you aren't experiencing this then I would ask for more information.

Good luck to you...also on the runners world women's message board there is a specific thread devoted to women runners who are trying to conceive; you might get more information there. I wish you the best!

My ob/gyn said the same thing. He is a serious runner, and knew how hard it would be to significantly cut back on running. He said during ovulation and implantation is when the milage should pretty much cease. I stopped running for 3 weeks, and did get pregnant. I ran the day I delivered my daughter, and my doc loved that, and said it was great. So, for him to say not to run during ovulation/implantation meant something to me.
Although, my cycles are very irregular so I think he wanted to increase my chances. Good Luck.