I had unprotected sex 3 months ago since that time I've had light menstrual cycles 2 cycles in 1 month and the next month I was late 3 days and stressed out to the max and by the 3rd that started real light then got dark almost brown I took a test after I finished that cycle and told me I was not pregnant now this month I'm 5 late is it possible that I am pregnant? Or do I have extreme issues?