Irregular Periods (UGH)

I honestly HATE having irregular periods. It makes it SO hard to try and conceive because I never know when the flip I’m ovulating. My periods are so irregular this app hasn’t even adjusted to my cycle... and ive had this app for THREE years. It still gets my periods wrong and I don’t even know the true length of my cycle. If anyone has any tips on conceiving easier for people with irregular periods PLEASE help.