Abnormal Gestational Sac?

Nelly • 🐼 Nelly 🐼: IVF#1: 3 Failed FET.||IUI #1: MMC @ 9wks.💔|| IUI #2&3: Neg.|| IVF#2: Nov 2020; FET#4: 1/28/21-💕Born 9/21/21 ✨🍀✨💛✨🙏🏽✨🍍✨🙌🏽✨🌈✨

Has anyone had or seen a gestational sac this shape? I was reading that this is abnormal? This was taken at 5w4d but was measuring 5w6d....oh and I did see a heartbeat.