quick question

ok so whilst visiting my hubby i jad my fertile days and we went for it bc im not normally there on my fertile days.. i ate as i always do when i visit and put some weight on. I could help the urge to test on the 24th sept and it was negative but my periods werent actually due until the 3rd of October. appart from the weight ive put on due to over eating, my breast have grown and my nipples have been hard for like 2 wks straight now. i was due for my periods on the 3rd and its the 7th today and i still dont have them. I know sometimes flying delays them. Im trying not to get my hopes up bc i will be really disappointed but could the delay with my periods be bc of my 14hrs flight?