So I'm not pregnant because the last time I had sex was June, and since then I've gotten 2 IUDs put in (which requires a pregnancy test beforehand). I've been tracking my period on this app for a couple months now, and I'm just concerned about my late period because their estimated start date the last 2 months was spot on. The IUD has been out for a whole month now, so when should my period re-regulate itself?