Period 9 days early

Meagan

My period is like clockwork every 28 days, but this time around it’s 10 days early.. to me its not implantation bleeding because it turned from pink to red. We are trying to get pregnant. The cramps are much different than a normal period of mine. And very mild. But I’m wondering I had a sonohystogram at the end of my last period has anyone had this and noticed their period came early?