Roller coaster trip :( period!!

My family and I (I’m 14) are going on a family trip to an amusement park. My aunt uncle brother mom dad and my bros girlfriend are all coming but I have a problem they want me to come on the big roller coaster with tons of twists and turns and jolts and mr period is supposed to start that day! 😭 I have a bad back already (start of scoliosis) but I’ll have even worse back pain now.

Do you think my family will think I’m weird if I tell them “my back hurts” or is that too babyish :(