What Causes Fever And Lower Abdominal Pain?

Hi, I am trying for pregnancy. Today is my 29th Day of cycle. From last 2 day I m having mild fever less than 99.5. Also I had some lower abdoman pain some 5-7 days back. WHat should I do? Is this a symbol of pregnancy or should I wait some more days? Should I take any tablet for fever? I am very scared. Please Help