A false and positive pregnancytest in two days?

Hi just wonderin about other womens experiences on this... 7 may 2011 was my last period had on 20 may -26 may (TTC and I was ovulating then) havent had my period yet im not due on that for another 4 days but im experiencing on and off again lower back pain, breat tenderness/fullness, nausea, increase in vag. discharge (TMI I know), headaches and these symptoms are not all constant I had d&c 29 june 2010 and removal of cysts on 8 apr 2011 my doc said it should be faster to get pregnant but on 2 jun 2011 my test was positive and I took another one 3 jun 2011 and that was negative coukd I possibly be pregnant? My fiance and I want this soo bad we are tired of disappointments. We would love to be pregnant. I take a blood test in 3 days I just wonder has any other woman been through this and their results were positive!!