Talk to Gynecologist on Ecp And Period Issue

i took ecp a month ago just right after my periods ended, my this month periods were expected on 4th august but today is 7th august which means its almost 3 and a half day late, i'm really worried please suggest me what should i do. (my height is 5'6 and weight 72.5 kg just in case if its needed). i never took ecp before. few months back in feb i took breeky tablet ( only 1) and got my periods in a regular way without any problem but this time its late maybe due to ecp but im really worried please guide me