Weird brown period

My AF was due yesterday and showed bit only with brown spotting. I was expecting heavy flow this morning when I woke up, but still only brown watery with a few tiny clots. I have tons of cramps like my period. Also, I'm pretty sure I'm not pregnant, I tested twice, bfn and my temps dropped. I am on Clomid and wondering if this could be from Clomid. I've never experienced this, I am very consistent and also not stressed out.  Any insight would be great.