Patient :I'm pregnant and not sure who the father of my child is. My last menstral period was Jan 31 and according to a period tracking app I ovulated Feb 18. I slept with an ex on Feb 9th and a different guy on Feb 13. At my first ultrasound today they told me I'm 9 weeks 2 days which based on that math is the exact day I slept with my ex. How accurate is the ultrasound at dating? Can I be sure that it's my ex's child?
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