I have a few questions?

Why don’t you ladies just wait till after your period is late to test? I got my bfp 3 days after my missed period. Also what’s the point of buying sooo many tests at a time? It confuses me... is it really that hard to wait? I mean I was ttc for 3 months but never went crazy buying so many test and testing before my period was late. I’m just confused I guess 🤷‍♀️