Update needed for IUD users.

As other ladies with IUDs can confirm, your period is not regular at the beginning of having an IUD. Also we shouldn't have "fertile" days considering how this form of birth control works. I started using this app because it had great reviews for predicting your period, even with an IUD. Well my period came a few days later than it usually does, stopped, and then came back 6 days later. But I can't add that to my cycle chart.