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If your "period" was considerably lighter and shorter than what is normal for you it may not have been an actual period. It's possible you just had some breakthrough bleeding.

The other possibility is, of course, that your hormones were just doing something odd. You can have an LH surge and not actually ovulate. I'm assuming the ovulation was detected by the LH levels in your blood from the blood work. If that is the case it's possible there was just an LH surge without ovulation. I've seen several stories of women getting positive OPKs more than once within a cycle. Temping confirmed they didn't ovulate after the first positive OPK but went on to ovulate a week or two later or whatever.

It does sound like whatever happened was a little unusual. The only way to be sure is just to wait it out and see if you get a BFP or a period in the future.

Wishing you all the best! :)