Measuring 2 weeks behind

According to my LMP I should be 9w1d but at my first ultrasound today the lil babe measured 7w1d.
I have irregular cycles. And I’m almost 99% sure we conceived May 4. Is this normal?
Have you measured 2 weeks behind according to your last LMP? Or is it okay because I have longer cycles and conceived May 4....
Thank youuuu
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