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My cycles usually are 27 days and I usually have a 13 day lp. Hope this helps. Confirm it with ovulation test though. Regardless of the length of your cycle usually there are other outside sources that may delay ovulation which can cause you not to ovulate.

If you have a 14 day lp (which is avg), then yes, you o on day 13. The only way to confirm that, however, is through temping. I had 27 day cycles, and the month I conceived we bd every other day from CD 8 to CD 20, but I never got a positive opk, so don't rely on them. Also, you want to be having sex before you even get a + opk in case you o the same day you get a +.