I dont think it's a good idea regardless of how far you are. I actually watched a video of a little boy scaring his mom and she was pretty far along and as soon as her son scared her, her water broke you could see it like gush out through her pants lol so i personally wouldn't do it just for the fact what if your water breaks.....it'd be pretty embarrassing lol but it's all up to you.
I am from Alabama and have went to 6 already but the doc only ok it because I am in my second trimester cause we flew to st Louis for 3 of them. If u don't get scared to easy and don't get pushed around u will be ok.
I went to knotts scary farm and there were a few ladies in their last month there. And they were going through mazes. But I also had a friend whose aunt got scared and went into labor. So I guess it probably with what your comfortable with.