So confused..

Ok y’all, here’s what’s up. I started my last period on April 19th and it lasted almost 2 weeks (I miscarried in February and they’ve been off since). I confirmed ovulation 8 days ago with OPKS. Yesterday being only 7 DPO I got a positive test and today being 8 DPO it’s even darker. According to the calculator I’m only 3 weeks 3 days. Isn’t that extremely early to find out you’re pregnant?!😳