5 week hcg levels and nothing on ultrasound

Alexis

Yesterday I was 4 weeks 6 days according to my last period. I went to the ER because of spotting and cramping. They ran my hcg levels and they were 263. The doctor said those are too low for almost 5 weeks. They did an ultrasound and said they saw nothing, but I never got to see them myself. I get my blood tested again tomorrow to see if my levels are going up pr doubling. Did anyone else have levels this low at 5 weeks and everything be okay?