Walking During Pregnancy

For the past 3 weeks I have been trying to walk at least 3 times per week. I am half way thru my pregnancy now and walking is starting to become more difficult. It's not as easy to just go out a walk a mile or two. My lower abdominal muscles sure pull while walking and I get out of breath much faster than normal. I sure home it gets easier to walk the more I do it. I know this will only help when it is time to deliver, but also when it comes to putting on weight and maybe, just maybe I won't have gestational diabetes with this pregnancy. We can only hope.