finding out due date!

Help! I have a question, I just found out I am pregnant about 4 days ago and I know they go by the first day of your last period which mine would be May 19th butttt my periods are weird and aren't on a regular 28 day cycle, glow was showing that I should be getting it June 30th so what would the doctors go by to figure out my due date!? Please help!

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