May I stopped taking my bc

May I stopped taking my bc. My boyfriend didn't think he could have kids so it was kind of if it happens it happens, kind of thing. I went in this am for surgery. I got all changed, my iv in and the nurse came back and told me I was pregnant ! We were in shock. That was my news at 630am this morning ! Lol . My period wasn't suppose to start until Wednesday , so this Wednesday I'll officially be 4 weeks.