Need some help: Large Yolk Sac

Lindsay
Has anyone been diagnosed with a large yolk sac (0.7cm) at 6w5d and had the pregnancy proceed as normal? The baby measured only 2 days off from my LMP estimate due date and we saw/heard the heartbeat at 140bpm the same day. Please share your stories if you have them! We're hoping a strong heartbeat trumps the yolk sac concern but we're also very worried.