Horse back riding?

Hey ladies. Im 13 weeks and 4 days pregnant and am a very experienced horse back rider. I’ve been riding since I was 5 years old. I rode horses through out the first trimester and the baby has been totally healthy. I know that theres a time where I’m going to have to quit until after the baby gets her. If anyone else was pregnant and continued to ride when did you quit? Riding horses is my job so Im trying to figure out when i need to quit riding.