Should I start femara?

Hi ladies!

My period was due for August 1st but it didn’t happen. I’ve been experiencing a lot of cramping this week. And it’s been 2 days that I’ve been spotting very light brown/pinkish..sorry tmi..and I was wondering if it’s considered a period or do I wait for an actual period before I take femara? I’m confused because I’ve never taken femara.

And my dr recently put me on Metformin, which I started it 4 days ago.