Negative blood test but could I still be pregnant. ..or am I out

I have a normal 5 day flo pretty heavy and then med last days. This month I started a day early bled mid day dark red strechy, day 2 dark red and brown strechy off and on all day, day 3 light red on and off, day 4 spotting pink and brown and was really wet and clear between spotting, day 5 spotted orange and clear egg white....took test and lines are positive but not dark today i would be 16dpo and went to primary physician and asked for a blood pregnancy test and to my surprise it was negative. ...what in the world !!!! My boobs are still huge sore, nipples sore are super blue viens (Normally only last 2 days into af).. also sharp shooting pain in left ovary down to groin area. ...