How early is too early?

Danielle • I am currently a mama of 2 who enjoys working part time at Joann Fabrics while my kiddos are in school. We recently found out that our little family is getting a smidge bigger!
I'm just wondering what the earliest is that you ladies tested positive. AF doesn't start for another 10 days, but the past 3 days I've been feeling nauseous and now today I'm really dizzy and weak/shaky. Just trying to decide if I want to spend the money on a HPT now or wait longer. With my first 2, I didn't get morning sickness till about 6 or 8 weeks and it only lasted 5 weeks at the longest. So feeling like this is really weird for me. Any thoughts? Thanks in advance!