Help!!

Becky
As if I wasn't nervous enough about ttc at 36, now my af won't come on! 
I started taking fertilaid about 4 days before my af was due. It didn't come on, and I was very tired, had breast soreness and "letdown" sensation (had that when I found out I was pregnant with #2), and a little nauseated, so I took a test and it was neg. 
Now all symptoms have stopped, but my af hasn't come on. I quit taking fertilaid yesterday, in case it was messing with my cycle. What gives, ladies?