Today a blood clot just pop up inside my mouth on the right cheek it scared me where did this come from?

Clot... That looks like a blister is probably from cheek biting. It should resolve in two week. If it disappears, then don't worry about it.
Trauma. There was probably some trauma to the area. Keep an eye on it. It should be gone in 10-14 days. If not see your dentist or physician.