Supposed to start clomid tom but I think it's wrong??

4 days ago I had just light pink off n on when I wiped, dr. Told me to count as day 1. And everyday since then off n on brown spotting ( not enough to fill a panty liner even hAlf way) the rest of days( lots of little tissue strings when I pee) tomorrow day 5 supposed to start clomid but I haven't even started (bleeding)! What to do???