Second verse, same as the first?

Well, AF just never did come... A week later I got impatient, called and whined to my nurse/doctor and they told me to:
A) take a pregnancy test... Riiiiiiiiiiiiight, because I would be that lucky? NOT! Of course BFN, I never even ovulated! But ok, we had to make sure.
B) If BFN, then start Femara again, this time twice the dose, 5mg.

So here I am on my 4th day of Femara wondering if this is going to work. I have felt the same little "twinges" off and on since day 2, but nothing else. Something I realized last night was that while not as bad as with Clomid, nevertheless Femara has always given me headaches. Last month I didn't get any and it turns out it didn't work... Are those 2 factors related? I have no idea! Maybe it's just a coincidence, but my paranoid/pessimistic mind is thinking hmmm... no headaches last time, no headaches this time... will next week's folliescan show the same nothingness as last month's? Lets hope not...