Congrats! I stopped riding while I was pregnant but that was more because I didn't have a well trained horse and didn't want to take the chance. I did go on a couple of trail rides during one or two of my pregnancies, but they were fairly mellow and fairly early on. That being said I didn't stop doing much else....climbing ladders, carrying heavy things, everything I was used to doing on a daily basis I still did.
Many people have sighed for the 'good old days' and regretted the 'passing of the horse,' but today, when only those who like horses own them, it is a far better time for horses. ~C.W. Anderson