Diet caused early period

So I normally have a late period. Like the app is always a week too early in its predictions. My symptoms always start over a week in advance, especially tender breasts. But I just started eating healthy and even some days I’ve eaten way below 1,200 calories (I KNOW it’s very unhealthy, I’ve just had a hard time with my appetite). Anyway, my boobs started feeling tender yesterday morning and this morning when I wiped I noticed I was bleeding a little. Is this ok? I started early and that never happens.