While most women are familiar with common signs of pregnancy like missed periods and morning sickness, not everyone knows about the lesser-discussed early pregnancy symptoms — but is heartburn one of them? Let’s get into it.

We’re always hearing that “you should only test in the morning” or “testing after you’ve had too much water won’t work” – but is any of that true? And is there an optimal time to take a pregnancy test? Most at-home pregnancy tests are 99% accurate if they are performed correctly, so we’re breaking down how they work, when you should take them, and how to know if those all-important results are right.