Is it possible that i am pregnant?

Ok so I am on birth control, Yasmin, and I havent missed any pills but I dont normally take them at the same time every night. Me and my boyfriend dont use any other protection and we had august 22, 23, 24, 25, and 27th. I have regular periods and it says i ovulated on the 26th. That was 3 weeks ago. I have been feeling extremley tired, hungry, i have heartburn, nausea, my temp has been elevated almost everyday between 98.2-99.5 and my are sore. I know its a little early but what do u think the chances are that i am pregnant?