Short periods!

Lily
Hi, (frist of all, excuse me for my English, but I am Italian), today I have read my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period calendar</a>, and I have understand (it's correct?)  that my cycles (or period?) is short, 22-23 days and 3-4 days of blood (?), it's normal?