You need to be in the same place, at the same time, every day, and always have them with you, continually. You also need to keep them dry and at room temperature all the time, so no leaving them in your car.

Here's another example of a pill that needs to be taken every day, at approximately the same time of day: https://www.plannedparenthood.org/learn/birth-control/birth-...

From this article on that pill,

> But people aren’t perfect and it’s easy to forget or miss pills — so in reality the pill is about 93% effective. That means about 7 out of 100 pill users get pregnant each year.

You mess up and you have HIV for life. It's better to have something that provides more stable protection :)