you can ride only with the expressed permission by your ob-gyn. since i do not know you the stage of your pregnancy or your medical/obstetric history it would not be prudent to offer you a patient-specific response in this matter
is it okay to ride horses while pregnant? . i have ridden for years and it's not like i would ride crazy horses or go faster than a walk. i know what im doing and don't see the harm in a slow walk.