Hi I have had pregnancy symptoms for the last two months such as weight gain, exhaustion, nausea, urinating frequently, and cravings. I also have had stretching and cramping feeling in stomach and lower back. I have not had a normal period. It only lasts 1 to 2 days very light and goes away. I normally have very long heavy periods of about 5 to 6 days. I am only gaining weight in my stomach and chest. I have taken several hpt and one urine at the doctor. They were negative. Could I still be pregnant