Ovulation Dip or Spike?

Courtney • 28 TTC #1 MC IUI #1 BFN IUI #2 BFN IVF #1 BFN IVF #2 BFN IVF #3 BFP MC IVF #4 BFP MC Natural BFP!!! DD born 3/3/18
I have been tracking my temps for months now. Some months my ovulation is marked with a temp spike:
Some times it is marked with a temp dip: 
I'm just wondering which ovulation is supposed to be marked with: a dip or a spike. 
(Ovulation confirmed with opk)

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