Tons of watery brown CM after AF

I just finished my AF yesterday (I was lightly spotting this morning). This evening I felt like a gush in my underwear..(sorry for the TMI) and when I checked it was a ton of watery brownish CM. it's been happening for the past hour or so. Is this normal? This is my third month off of BC and I'm wondering if it has something to do with my body regulating itself? Thanks!