Protected sex

It's been a week since I had protected sex with my bf. I think nataon po na ovulation period ko, di ko rin sure. It was our first intercourse, kaya after non sumasakit tiyan or puson ko for a week. Now naman nawala na. Also, I'm expecting na magkaroon ako this week. Is there a possibility na maging preggy ako kahit gumamit siya ng condom?