I think it would be too late to catch it this cycle. If you know the length of your cycles from the first day of one to the first day of the next, you usually go back 14 daus to pinpoint where you ovulate (or try!) On a 28 day cycle, ovulation is typically on day 14. I have a 31 day cycle, so I usually ovulate on day 17, and see the LH surge (what the tests test for) on day 16.
If you bought a kit with 5 sticks, I would maybe start testing on day 12 of your cycle to see what you come up with. I only had to do this for two cycles when I was going through some fertility issues (tried artificial insemination unsuccessfully before we were able to conceive on our own!), so others with more experience might have better ideas.
at 1:59 PM on Mar. 1, 2011