hiking with health conserns

just wondering what kind of modifications other do or need to do? i have found out i am pregnant, and when we went hiking this weekend, the planned 4 hour hike was cut to 2 hours casue hubbie hadn't packed a snack (neither had i) and i could feel sick gonna come on if i didn't eat.  not used to letting my body tell me to stop doing something i am enjoying! next time i will have some bread and fruit with us!

I have two dogs who take a great deal of exercise - and quite honestly i walked them for 1-2hours all through my pregnancy (woods are quite handy when you get to the later stages - with the frequent need to tinkle). 

I found that your body is extremely good at letting you know your limits and yes snacks are absolutely a must.  Even if its just a biscuit or two in your pockets.

I would say though you will get extremely tired in the first few months and four hours might be a little ambitious - you might be better off starting on shorter hikes of maybe an hour and working out exactly how far you feel comfortable.

I enjoyed exercising in pregnancy except for the last month when the ankles and other bits and pieces were not quite as gung ho as i was. 

I have been gradually increasing my walking and now really enjoy hiking 6 to 10 miles. Between walking and calorie counting, I have finally lost my first 50 pounds. My husband is no hiker, so my hiking buddies are my 2 german shepherds. I end up on the local rails to trails frequently because it's close, well marked, well travelled--being as I am alone, and has good scenery.

I am having trouble with blisters at this point. Actually, I've always had trouble with blisters when I've tried walking programs. I have lost at least 4 toenails to blisters and this weekend had to scrap a hike because of a particularly painful blister on my heel. I have been using MBT shoes because they protect my knees wonderfully. I also was doing fine with blisters until I started adding distance.  I tried going back to some cross country running shoes I have and I thought my knees were going to break.

Does any one have any suggestions?

I personally have never had problems with blisters but several members of my hiking club do. We have hiked the Grand Canyon Rim to Rim twice now and learned that covering the area that you normally get your blisters with first aid tape ( the paper type works best) stopped any blister from starting. We found several layers worked best.