I am sorry that this is happening to you right now, I do hope that it is just spotting and nothing serious.
To answer your question, yes, that is how my m/c started out, it was VERY light brown discharge when I wiped and at first I noticed it in my underwear, this started about two days b4 I actually started to bleed. Once I started to bleed it was more like clots, sorry if TMI. Also wanted to let you know, the girls in Pregnancy Loss are really great if you have questions, they truly were my saving grace when I started to m/c.