Which date should I go off?

Guest_1610220279421
I just found out that I am pregnant, and am not sure which date to go off. I had my IUD removed the end of April, had some spotting, and then haven't had a period since. my LH spiked a couple times, but technically wasnt positive. Which date should I go off of for the date I conceived? the spotting or the LH spikes?

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