Sometimes you can have spotting before an actual proper bleed. I will usually have spotting up to 4 days before a proper bleed. Maybe wait until tomorrow and if still nothing then call your FS and see what they say. When i took my clomid last month i started on day 5 and AF was short (bout 3 days) and by the time i got the script it was almost gone.

I hope Af shows again for you Good luck