Measuring earlier then I thought

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So I went for a private scan today thinking I was 7W1D but the ultrasound confirmed 5W4D. My cycle is irregular and longer so maybe I ovulated later than I thought. We did see a gestation sac, yolk sac, fetal pole, & flickering which I know are great signs. Me having previous miscarriages I’m worried of course. Has this happened to anyone else ? What was your outcome ? Should I worry ?