What the chance you could ovulate twice in one month

Genna
I ovulated Feb 17th and again today this is today's test 2/23/16
It's a bfp on an ovulation test I'm so confused by this.Because I took one yesterday and it was a bfn..im like 8 or 9 days out from af so my question is can someone ovulate almost five days after they already ovulated.??. 

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