HCG Levels

Just got the call yesterday that my HCG levels at 7 weeks were 76,612. I know you're not suppose to look that much into HCG levels but they did mention that since my first scan wasn't done by a ultrasound tech (she had left for the day so the dr came in and did one for me. He also mentioned he had no idea how to work the machine. Lol) that they want me to come in again on June 8th and do another ultrasound to "make sure there isn't a nugget hiding". So what were yalls HCG levels at 7 weeks? Why did they mention something about another baby hiding. Just looking for input. Thanks ladies!