Taking final exams is really stressful for everyone. And cycles often get messed up with stress. I would guess that some of your fellow students also have had unusual cycles. It can take a while to come down from the stress of exams, when your body does, your cycle will probably go back to normal. I'Ve talked about more embarrassing bodily stuff with my T. I can't imagine that your T will be phased by it. And you will probably find it a relief to talk about it.