When should i start testing?

Hey all!! i’m TTC after a stillbirth in September, and a chemical pregnancy last month. i am 7DPO today, so far the symptoms i’ve noticed is pretty noticeable cramping, and being tired more than usual. my period is due the 14th, so i was just curious when i should start taking tests? i know everything online says to wait until you miss your period, but i have a good feeling this month for some reason. i would just like some input from others who might know more than i would. thank you😊