If you did it before you were pregnant you should be fine
I ride horses all the time i was told as long as u truley trust the horse ur riding and just stick to slow trail riding nothing to bouncing you will be fine my doctor is a fellow horse lover ride as long as u feel comfatable i know many people who road till they where 40 wks and didnt have a problem so i say its more of a personal call sure therez a risk but if u trust u and ur horse i say go for it im 20 weeks today and still riding my horse
I would ask your doctor, but I think up to 11 weeks is ok as baby is tucked in well, but after that definitely not as the ride can actually cause the placenta to pull away from the uterus, not to mention the possibility of falling. Honestly I would just stay away from riding until after you are cleared by your doctor after birth.
Not safe anymore, sorry! I love horse riding too and we'll just have to put it aside for some months now!