Brown spotting?

Ashley • Feminist, atheist, crazy cat lady with a penchant for macaroni and cheese. I'm 31. Our daughter is baby #1 and she's due 11/30/17. 🎉👶🏼💜
Last Thursday and Friday I had small amounts of light brown spotting.  It came back today, and I have a ripping headache and mild nausea.  I haven't had a period since 2011 and I'm off birth control, could this be my period finally making a return or something else?  I have no idea where I could be in my cycle, it's been so long.