My MIL told me to wait for 10 days, but I checked on the first day of my missed period. The home test was positive, and our family doctor confirmed it the next day.
Please wait at least until the day of your missed period to test. Early testing can sometimes show chemical pregnancies which are very painful to process.
My third trimester brain can barely remember when I tested, but I think it was 2 days after my missed period. Save your energy for later, don't start testing too early!
Haha, I know the urge to pee on a stick every 5 minutes is real! But seriously, wait till your period is missed or you'll just waste money on test kits!
The most reliable way is to test the morning after your period is missed. That's when I got my clear positive and went on to have a smooth normal delivery.