Ok so my period is not due for about 3 more days and I started spotting (medium) about 5 days ago , its went from medium to light to heavy with small bloodclots and Idk whether its my period now or not or if I'm pregnant (please no!). But I have been gettin lightheaded wen I stand up too quick or raise my hands above my head for a period of time.. Please help or try to explain to me wat this is please..