HELP!!!!!!

So ladies, Saturday I took two hpt and they were both positive, I went to the hospital, where they done a qualitative blood test in which came back Neg. So I went home and immediately took another hpt which again came back positive. The doctor at the hospital told me that their qualitative test just may not be consider me pregnant yet because my levels are still kinda low...... but Sunday morning I woke up to some light bleeding so I am now extremely emotional about the whole thing and don’t really know what to think. Has this happened to anyone else and have you actually been pregnant and how long did the bleeding last??? Please help any info will be welcomed!!!