Period at sea breeze or should I pass?

C
I'm supposed to be going to seabreeze (roller coasters, amusement park)and I'm on my period. The cramps and bloading and back aches have been horrible for the past three days and I don't think I'm feeling up to it but I wish I could go so badly god damn it😡🔫. My dad probably will make me go but if I feel even worse, how can I tell him I'm not feeling good at all?