Help?

Dawn • Mama to Samuel Andrew Lee Borger💕 4-1-18💕

I went to the ER today due to severe cramping for the last day or so but no bleeding. They did a hcg test and ultrasound and I'm measuring at 5wks 6days but according to my obgyn I should be around 6wks 3days. Is this normal? Should I be concerned? My hcg level was at 11587. Also on the ultrasound it stated that there was no fetal pole or heartbeat detected.