Yes, no worries. BOTH of my babies were upside-down in their first ultrasounds... then when I went for my NT scan at 11 1/2 weeks with my son, he was not upside-down... most of the time. He was, however, flipping and dancing and doing all kinds of things, so never know what positions they're in at that point! lol... But yes, it's very common for them to start out upside-down.