Pregnancy

Isabel
Hi, my husband and I talked the other about planning a baby for July-August... But yesterday I was supposed to start my period... At night when I was on my way home I stopped at a pharmacy and bought a pregnancy test (clear blue with week predictor)... I really don't know why I felt the need to buy it... However, I took a test this morning and said I am pregnant (1-2 weeks)... I am really in shock, extremely happy and excited but in shock... Lol!!
The question is... Since I couldn't believe it... And there was another test in the box, I decided to try it and tested again... My shock is bigger since it came out... Not pregnant 
Is this normal? Am I pregnant? I was thinking of buying something cool for my husband to celebrate his Father's Day... But now I don't know... 
Can someone please help me? I don't know what to do or think now