Hook effect real?

I got a positive Dec 29 @ 9 dpo next day started an extremely light period didn't think anything of it... Never got positive ovulation test... Got period light again in February no positive ovulating test but dark ones really dark ones early March light flow... Today with a trickle of a one hour hold and some toilet water I got a bfp is hook effect real? Can this happen? Also breast engorgement and nausea

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