Bleeding 2 days before AF

I've been TTC with my husband for 2 months. I have very regular cycles, typically 25 days long. This morning I woke up with light pink spotting (*sigh*), then this afternoon/evening it turned to be much heavier (I had to change a tampon after a few hours). Has anyone experienced that before? I was hoping that this was our month but I've lost hope after today. I'm also quite perplexed as to the early heavy spotting. Has anyone been in a similar situation?