could i be pregnant?

Jewel
i took the plan b pill I can't remember the exact day I know it was between monday the 6th and thursday the 9th of October, im currently using this glow period tracker app to try and keep track of my periods because I've never been good at it and now im not sure how long it will be until my period shows up and if the first one does show up soon I will then be worried about the second period.. will it be a long time between the two? I've read that when taking the plan b pill it can make your second period as late as two months but this is the thing im scared to death to take a pregnancy test it's terrifying.. i just need to stop stressing because it'll delay things even longer.. but any advice on my situation?