period came right on time but no bleeding?

I was due on today. But I usually start spotting a day before I actually start bleeding so when I started spotting yesterday I didn't think nothing of it. It was pink and red spotting (never usually get red the first day). By the next morning I usually wake up to a pad full of blood but instead I'm still just pink and brown spotting. I hope I start bleeding properly by the end of the day. What could be wrong with me? This has never happened before and I'm ttc so I hope nothing is wrong with my periods as I know that can mess up ovulation 😔