It depends on what you mean by stop - the probation officer can set conditions on where you travel, can require you to work, seek employment or be in school, not to consume alcohol or illegal drugs and to drug test, and to not associate with certain people, including those on probation.  He or she can't say, "You can't get married" but can say, "You can't travel out of state", especially if you're facing an upcoming probation violation arraignment. You have the constitutional right to be able to get married within the area where you are allowed to travel.