Empty 4 week gestational sac, bleeding, dropped hcg

2 weeks and 3 days after I stopped bleeding from "chemical pregnancy" after hcg going from 250 to 500 in a week and then 48 hours later dropping to 169 and being told it would pass naturally... Now  woke to breasts swollen to twice their size and suffering nausea. Along with a positive first response test.    At hospital now to get a blood test.   Very nervous.