How long did you TTC before you started OPK's?

C

We're at the end of our first month TTC with no tools or anything besides Glow and Ovia. I haven't gotten my period yet (but not due for a couple of days) and I'm not feeling hopeful. We're both 23 and healthy. Is it too soon to start OPK'S? How long did you take to start using tools and what did you use first (opk, temping, preseed)?

I'm thinking every month maybe I'll add a new tool. So next month, opk. After that, maybe preseed... etc.