Confused

Cassie • I live with my amazing boyfriend and my awesome 8 year old son
I am 29 and have always had fairly regular cycles. Last month I only had 1 day of bleeding 2 days before I was supposed to start  followed by a couple days of spotting so I took a test because it was unusual. It was negative so through out this month I have taken a few more just to know for sure  all negative. Now I am 3 days late and no real signs I will start and no real symptoms of preg either. I have a dr appointment set up for the 7th just wondering if anyone has any ideas or any thing similar