WHEN SHOULD I USE FIRST OPK?

[ebeson]

Hi, my cycle is between 30-35 days so if i get some opk's, what day in my cycle should i use the first one?

bump

Since the luteal phase is rarely more than 14 days, you probably ovulate on day 16-21. So I'd start around day 12 to be on the safe side, and so you can see the line getting darker. Or use the digital ones, so much easier (although also ridiculously expensive).