Testing for pregnancy

I know some of the pregnancy tests say they can test as early as a week before a missed period and detect a pregnancy but with the way my body is ya girl isn't buying that for a second.

In your experience, when is the best time to test for pregnancy? Right after a missed period, wait a few days, wait a week? For reference my period is always consistent and comes at the same time every month, the only time it was out of wack was when I was super stressed about 729337 things and it definitely delayed it. Any comments are much appreciated 😘