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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
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