Delayed period on holiday?

Megan

Hi guys not sure where to post this just looking for some advice or if anyone been in similar position. Me and hubby are TTC and since coming of BC in Dec I have had regular periods. I am currently on holiday in Mexico and AF was due on Friday past. No sign of her showing and have had some symptoms. I didn't bring any tests over with me so planning on testing when back next week if AF hasn't shown. How likely is it I'm pregnant? I have heard that travelling can sometimes delay your period but I have not had this problem before? Thanks x