When would 1dpo be for me ???

I got my positive opk cd 16( March 19th) at 7pm and was almost positive the next day ( 20th) but I got more of a temp dip. Is it possible I ovulated later in the day on the 20th ( past the time I temp which is 7am ) since my +opk was so late on the 19th. And the temp rise didn't show till the next morning ?  Anyways so to you what day do you think I O'd and how many dpo am I ? 

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