Advice?

Kaitlin
Hello! This past month has been a little odd for me. My periods have always been very regular but. A day before my projected period, I had a little spotting and continued to spot off and on for four days. I've taken two HPTs and of course no BFP. But I still haven't had an actual period so I'm sort of confused as to what could be going on. Any kind of advice would be greatly appreciated. Thank you!