Due date keeps changing by two days, first trimester.. did this happen to anyone else?

I get an ultrasound every week at this point. I am being seen by my infertility doctors. I’m at my 9 week mark and I keep measuring 2 days early and then two days behind. Last week I was at 8 weeks 1 day when I was supposed to be 7 weeks 6 days. Today I went in thinking I was 9 weeks 1 day and I measured 8weeks 6 days. Did this happen to anyone else?

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