Just a stupid question...

I've been having dark brown discharge and I've never had this before. I'm due for my period in 2 days. I think I've just been reading way to much online. Has anyone else had anything like this happen before? We've been TTC for a few months and no dice. But like I said I e never had a brown/dark brown discharge like this before especially before my period. I'll take any advice 🙂.