So anxious!

I'm 10 days post my 3rd try of IUI and I so badly want to test! This is my 3rd IUI, and I read somewhere that your chances increase the more IUIs you have. Not sure how accurate that statement is, and if it is Im not sure if it applies to me because they were not done in consecutive months. The first was September of 2018, then December 2018, then May 2019. In any case, my period theoretically statts in 4 days and I know the brand of test I bought says it can detect up to 6 days before a missed period... but Im so worried about taking it and seeing a negative and then wondering if it's REALLY negative or just too early. And just when I make up my mind to wait, I read posts about people who got positives 4 or 5 days before their missed period and my indecisive cycle starts all over again! We've been trying for a 16 months now after a very early miscarriage and Im so tired of negative tests, and waiting, and AF showing up before my period is supposed to start. So tired of crying and feeling like an utter failure. Im praying, praying, praying that this is our time!