Two days positive opk 😥

I got my positive opk (as dark as control line) on 3rd and 4th February..i have started dtd alternative days..but i am confused that when will i ovulate..

Just e.g. Everyone here is writing i am 10 or 12 dpo but I don't know how to calculate.how i will write how many dpo i will be on so n so date..🙄

Please help

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