Riding a mare when being put in foal?

Okay so i have a mare that i am putting in foal next year about may. My friend is having a wedding in June next year which we were going to trailer my mare close to the church which is close to the yard and the bride ride her the last bit from the trailer to the chuch as it is her dream. I just want to know if there is any risk in losing the foal or anything because of her being put in foal only a month or so before? Obviously i dont want any harm to come to mare or the foal being inside her. My mare is very relaxed with travelling and usually loads herself before i can even get up the ramp with her.