My late when no one is looking

For me my block 2 math class is so hard to concetrate through the entire 40 mintues and when its an hour block i go insane. In order to keep somewhat attentive I go to the bathroom every single class during that time, i have to because i need a break not to go to the bathroom but to walk around and get air. So i try to discretely get out of my desk when shes not looking as well as the class, just because i dont want them to think i have a problem considering i go every single time. Everyone in the foyer notices and they say i have an uncontrolable bladder which is completely false, however seems very true. this bad habbit started in the winter when i really lost focus in math because i was into college and didnt feel the need to try as hard as i did in the fall.