Ay, I haven't personally experienced this myself, pero a few of my mum friends had similar findings during their early pregnancy scans, at honestly ang dami nang bumuo ng healthy pregnancies after getting that result. I think it's really best to follow up with your OB kasi they can explain kung ano talaga ang nangyayari and if there's anything you need to monitor or do differently, mas mapapahinga ang isip mo once they give you clarity and the reassurance you need, trust me. Sending you love, and I'm sure everything will be okay, but definitely don't skip that check-up!