US question

💚 Tydee 💚 • 2 previous MC in May & August of 2016. 1 Rainbow baby Zaylee 💕 & another one on the way 😊
I got an early vag US & my OB said I'm 5weeks and 5 days by ultra sound but by my period I'm 5 weeks and 3 days which one do I go off ?