Opk. How many days until it turns positive? Guesses? I have a very short cycle and I've gotten this for two weeks now. This is only my second month using these so I was hoping maybe some of you 'seasoned' users could advise me.

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It looks like you're still quite a bit off, BUT OPKs can turn positive way quick too! When it starts getting darker test twice a day. Good luck to you!

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The first time I used them I got a positve on the 2nd day, 2 days earlier than expected.  The 2nd cycle, it took 8 days and the line was very faint then overnight it was blazing positve. If you have short cycles you should ovulate soon after your period finishes.
Make sure you're testing in the afternoon and test twice if you think you might miss it... some don't get a really obvious surge so monitoring bbt can help as well as it should tell you after you've ovulated when your temp goes up.

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As others said, test often and not with FMU. It can surge quickly.

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Test 2x a day