Please Help** First Scan = Irregular

Samantha • Pregnant with baby #1✨

Good morning everyone ! I am about 5 weeks pregnant with my first baby. The other day my HCG was 2116, progesterone 25.4 and estradiol 312.7. Today, 48 hours later, i went in for another round of blood work and my first scan. I will get my blood work numbers back in a few hours but my nurse came in and said the tech saw something irregular. They want me to come back in another 48 hours for my third round of bloodwork and my second scan. What can irregular mean ? Has anyone ever heard irregular during an early scan ? Any info, thoughts, advice greatly welcomed ! Thank you sooo much !