Early Pregnancy Test

I took a test only a day before my missed period (according to the app, which isn't always exactly right), I've been having bad cramps and normally would have started my period after cramping so long. I got a super faint line on the pregnancy test, but after reading online, I'm worried it might be too early to know and that my chance of a chemical pregnancy is high. Does anyone else have a similar experience that ended positively?