I'm a regular person when it comes to my period. Sometimes they are a couple days behind or before, nothing major. It's usually pretty spot on. I'm 11 days late according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>. I took a test at the 7 day mark and it read negative. Is there anyway it could've been wrong? Was it too early?