Need advice? Could I be pregnant?

I'm 25, and have pretty regular periods off by a few days here or there is normal. I should be getting it in a few days. But yesterday I woke up and had heavy bleeding. I just figured it was early. No biggie. This morning it's like it never happened. There was a tiny bit of pink on tp this morning. Figured it was weird. Went to shower and now. Nothing at all. I took an at home pregnancy test. Figured why not. It's negative. Should I be worried about pregnancy still? Do I consider that one day my period? It's all just weird.