So I keep feeling like AF is about to show but every time I feel like its happening there's no blood. I've been seeing more than usual and my boobs are KILLING me... My nipples look darker but I'm not rly sure... I've been having hot flashes and lower back pains... I've felt sick to my stomach.... I've been having headaches and feel tired all the time... I'm currently 2 weeks past ovulation and AF hasn't shown... Could I be???