I wish I could tell you that this or that could bring it on, but really, in all the time I was TTC (trying to conceive), I never heard of anything (and I promise there was lots of time put into trying.. we just quit after another year and a half). From the time you ovulate till the time that you get AF, is usually about the same, and not very many external factors contribute to it's arival. I hope it shows up and is good and gone for you to get your test done.