Someone please reply

Before my mc in October, I’ve always had regular cycles. Anyway, I started bleeding on Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> which lasted 5 days. (I assumed it was my first period since the mc) my second period is supposed to arrive in 6 days but it’s already started🙄😫 anyone know why?