Hi, my last period started on the 16th May when i went on holiday for 2 weeks, i arrived back nt eh 31st and have had sex with my partner a few times since then, we always wear a condom however a few times we have started sex and them put a condom on during, my period has not yet started tho i have felt slight period pains, my periods are usually 28-30 days cycle from the start of each period. I have started to worry now my period hasnt started and i have not yet taken a preganancy test, could worry and the fact that i have been on a 7 hour flight since effected my period?