Femara and spotting

Rachel • TTC #1 - on the 20th cycle as of 3/16. Undergoing fertility treatments since 12/15.
Had my <a href="https://glowing.com/glow-fertility-program">IUI</a> 1/2/15 using Femara. Started spotting brown/dark red 1/8/15, and still am today 1/12/15. AF is due by 1/16/15... Anyone have spotting this late with Femara? Seems to be going too long to be implantation.