I had my bloods done last Tuesday my beta hcg levels were 61 . I had a scan done last Friday nothing seen . So I had more bloods done beta hcg levels were 134 . Had another scan today (Thursday ) still no sac seen , all was said is my uterine line is a lot thicker this time , awaiting blood results , is this normal to not see a sac at 5 weeks or should I be worried ?