Admitted to hospital... Possible ectopic. 😭

Lace
Had really bad pain in abdomen and around to my lower back.. SO took me to ER because it was terrible pain. 
After an ultrasound not finding any gestational sac- which I'm only 5 weeks 2 days... (Previous irregular periods and previous miscarriage at 7 weeks several years ago) my HCG level is 308 which I am told is super low. Because of the pain and the cysts they found in the internal ultrasound I'm being kept overnight. Testing HCG levels at 8 am and praying to god they are higher.. Much higher. 
I can't lose another baby... I will be so devastated. ): 
Anyone have experience with this? Very scared.