I just left my 7 week appointment at my Fertility Doctor’s office. Where we heard two heartbeats for our twins (131 and 135bpm), who we saw heartbeats for last week! And then he got quiet and pointed out something to the nurse and said “okay now Tiffany, there is a third sac here…” followed by some quiet looking/ probing and then he said he doesn’t see anything in it, or a heartbeat… yet. And that he wants to see me back next week for a better scan at his other office. Has anybody experienced something similar? Did the third sac just “go away on its own”? I’m so overwhelmed here!