If you are looking for a place to share your travel photos and stories, then try BigRoom.
Most women ovulate around 2 weeks before the first day of their period. Based on the info you gave, you were in/close to your fertile time when you had unprotected sex. It's possible you could be late due to other hormonal shifts caused by stressing over possibly being pregnant. Take a pregnancy test that is effective at this early stage to know for sure.