false postive pregnancy tests whats happening?

hi well last month i had postive and negative pregnancy tests so i went to see the doctor and he took a urin sample which came back negative and then i came on my period on the 6th september now my period is due on the 4th october and i have had 3 postive pregnancy tests again and one negative one (which was taken today at 5.30pm) i dont understand what could be going on i feel really tired and my nipples are very tender but not the breast ( i had an abortion 28th november 2008 ) and was woundering if this has messed me up and now im not able to get pregnant again im really worried and confused as to whats happening to me or what could be wrong with me

i really dont understand whats going on
 
I was always told that you can get false negatives, but never false positives
 
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