Please Help!!

So yesterday was CD14. For about a week and a half I have been feeling terribly cranky, sick, whatever, you name it. I did two hpt that were two different brands and both popped up with a faint but very clear positive. A few people I know also confirmed this for me too. Well, went to the doctors, got a quantitive blood test (NEG), ultrasound (NEG), and a vaginal ultrasound (NEG). Why would I even get two clear but kinda faint positives on two different test? Anyone else have this?