Ava is not intended to be used while you are taking hormonal birth control pills.
In most cases, you do not ovulate while taking birth control pills (if you are taking the mini-pill, you may still ovulate, but Ava is still not recommended even with that pill). Ava is going to always assume that you have an ovulatory cycle and will give its best guess as to when that is based on your data.

We recommend that you wait until you are off the pill and until your cycles have become regular before starting with Ava.