Cycle prediction calendar

CC

Okay so I saw a post on here saying that your prediction calendar changes on your periods that you've tracked, mine are weekly now because of my birth control, but the prediction is totally off. I'll finish my period and it'll say my next period is expected in 23 days when in reality it's a week later. My period used to be once a month before my bc so the prediction was correct, but now it's not. I mean I've tracked it enough to know exactly when my period will start but it would be nice if the prediction calendar changed with your period. Is there anyway to make that happen?