Pregnancy? please help me out?

Been doing the pull out method with my boyfriend for along time now. Have not gotten pregnant. Were not trying but if it happens we are responsible adults. I had sticky white discharge lately but it stopped after we had sex on the 26 of this month. He ejaculated inside me. Mind that we have done this once before and I did not get pregnant. The past week iv had sore boobs and my ovaries were hurting. So I am pretty sure I was ovulating. Iv had diarhea all today and my tempature has been highish. I feel like puking but have not yet. I do have a problem with my gallbladder which I'm on a waiting list to get removed. It does hurt on and off so it may be just that. My periods just keep coming later and later so I'm not regular. Last two months the period has come on the 2nd. Months before it was the 28. Do you think I could be pregnant? Chances high? I never really know when I'm ovulating cause my periods keep being pushed. I have normal 6 days of bleeding for awhile now.