I had a positive HPT last Thursday, the following day I had heavy bleeding and when I did another test it came back negative. The bleeding only lasted until Saturday, I had some mild cramps and pains in my stomach. I had a telephone appointment with the doctor on Monday for advice, she told me it was a chemical pregnancy and nothing to worry about. However I still have really bad nausea, weird sensations in my stomach and I feel constantly light-headed. Is this normal?