Hay, anak, naiintindihan ko ang worry mo, three ultrasounds is stressful talaga. But please see your OB as soon as you can, kahit ngayong linggo, para siya mismo ang mag-explain ng macro yolk sac at what it means for your pregnancy specifically, yan lang ang doctor ang sure makakapagsabi. Don't wait pa for the next scheduled scan kung kaya mo pumunta ngayon.
A few of us mums have gone through confusing ultrasound findings din, and honestly, the OB's reassurance in person meant more than kahit ano, kaya go na. You deserve peace of mind, at siya ang may complete picture mo. Sending you hugs, and praying it's all okay.