Extremely nervous!! Advice please!!

Brittany
I am 5 weeks and 1 day. We went in for our first ultrasound today and all they could see was an empty sac. I'm extremely scared because I had a miscarriage in Jan of 2016 and was diagnosed with pcos. I had my hcg tested Tuesday and it was 277 I had it tested again Friday and it was 533. I'm just praying this bean stays. Im so scared and just a complete nervous wreak.