feeling defeated

Emily • EM_ILY~ love and be loved~
My and my husband have been trying to conceive for a few months and I've used glow as a guide for when I'm in my fertile window and ovulating. But nothing. 
I'm feeling pretty down because I wanted to find out today that I was pregnant because my birthday is the 7th. Would have been the best gift 
I keep hearing of opk's. idk if I need to do more. Feeling defeated. Please any advice