I had intercourse on the 11th of june and had a light period on the 16th of june only lasting a few days, a couple of weeks ago i started what i thought was my menstrual cycle but it was only brown when i wiped hardly anything on the pad, today 03.08.2014 i have been getting cramps and had a very small amount of blood on the tissue, could i be pregnant as never experienced this before, thanks in advance for your advice..