female, 38, 5 5 130lbs.. had a surgery removing left ovary 2006.. last period 29 april. no menstruation til now.. been taking duphaston since early July but not on a regular basis.took a test about 2 weeks ago, showed a not so clear line on the test line.. then took another test again the other, showed negative.. still no period til now? any chances i am pregnant?? pls help.. i need an opinion to comfort me in some ways.