Hello and welcome to HCM
Progressive rise in HCG takes place in pregnancy, molar pregnancy and in ectopic pregnancy.
Ectopic pregnancy means that the
gestational sac is present at sites at places other than uterus like
fallopian tube.
Ultrasonography reveals the gestational sac with fetus in the uterus.
Absence of gestational sac in the uterus with an increase in HCG levels suggests a molar pregnancy,
blighted ovum or ectopic pregnancy.
I hope my answer helps you.
Thanks and take care
Dr Shailja P Wahal