Scared to test

I'm so scared of taking pregnancy tests now it's been officially a week since I was supposed to start my period I haven't been stressed out much lately things have been Rather awesome and going smooth been working like the regular and i still haven't started yet I even were around other females at work that are on their monthly and usually that'll make me start mine and here I am wondering getting excited I want to take a test so bad but I'm so scared of seeing a negative test and my fiance wants to be a daddy so bad I don't want to disappoint him anymore should I keep waiting ? Maybe give it until January the first? Usually every month I'm getting my period and it's shown up idk I need advice? Help lol