Am I really pregnant , tmi in posts

Samantha
I am 3 days before my  period yesterday I used 4 internet test strips  from ebay all said positive I then bought a more expensive brand and was negative , this morning I did two more Internet  tests came back positive then I used and clear blue digital came back not pregnant , I don't know what to think am I pregnant  or are these not a good test to use as they are cheaper 
Here is a photo first photo is yesterday 2nd photos are the top ones are from this morning along with the last one from yesterday any  advice would be great