Roller coasters and hot tubs at time of conception or just after conceived?

We are going to Busch Gardens and Sea World in March. I'm trying to get pregnant and would possibly be fertile a few days before we go. So, on the days we went to the parks, I would have just become pregnant or been pregnant for only a few days. Should I stay away from roller coasters and hot tubs? Or would it just be too early for it to matter? I do have a history of miscarriages. One at 8 weeks, one a blighted ovum, and the third most recent at just 5 weeks.