I also did lots of body pumps before I was pregnant. When I conceived DD1, I was so tired but still kept up with some of it. My doctor told me it's fine as long as I don't do heavy lifting and just keep up with those regular treadmills, etc. Well, now that DD1 is 11 months old and that I'm pregnant with number 2, I find myself pretty hard to keep in shape as I'm just exhausted by the end of the day not to mention that she's having crying spells at night due to teething pain! So hurray... these sleepless and unfit days are haunting me!