Could I be pregnant?

So me and my boyfriend did things without a condom. He pulled out and nothing went in but just to be safe we got plan b. I took it on the 5th of July (less then 12hr after doing it) and your suppose to get your period a week or two later. It’s the 19th and I still haven’t gotten it. Technically my cycle doesn’t start for 3 more day but could there be a chance that I could be pregnant?