How do I change my period?

Brit
On <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>, I have very long cycles and I've updated my health profile to say that I have long cycles.. But the app always tells me I'm 13-15 days late even though I'm not actually late. Has called for a lot of wasted pregnancy tests lmbo! Is there a way to change the calendar to actually reflect my cycle?