Testing too early?

Currently 8DPO and thinking of testing on 10DPO or 11DPO. I have been feeling a little nauseous (nothing crazy), light headed when I stand up, a day or two of cramping. The reason I want to rest early is because I am supposed to take a pt test at 13DPO and I really don’t want to if there’s a chance I’m pregnant. Very worried over exerting myself that much would cause damage. Ugh idk what to do!