Chemical Pregnancy

I’m 4 weeks one day and after five days of positive tests including positive digital Saturday and yesterday, today the line is barely visible on FRER and digital now says not pregnant. It wasn’t a planned pregnancy and the timing wasn’t right for many reasons, but this sucks. I haven’t started my period yet, but am certain I will. This is the first time we’ve had this happen and so many questions and mixed emotions. How is it losing something so early could hurt so much?