15dpo and....I do have pcos what is going on

Period is suppose to start today but for the past 2 days ive been getting this very very very pale pink discharge. No cramps. Just migraines. I told my dr. And she wants me to come in for a blood pregnancy test. I took a pregnancy test today and its negative. This is my second round of clomid. In so confused. BTW the light pink spotting comes and goes. It doesn't get heavier. Only when I wipe