Period or spotting

I am on clomid and am directed to take it starting on day 3 of my period. This is my 3rd round (had to increase dosage each round) and this period was late by a week.  I took a test but it was negative.  I started bleeding Sunday, but it was light.  Monday it was very light, too.  Then I have nothing today.  Since today is day 3, I'm trying to figure out if that was heavy spotting or a really light period. I feel really dumb about this, but would like input about it.