The couple, in their early 20s, rented a room at the guest house through online booking and checked in on Saturday, he said.
The woman's health condition deteriorated in the afternoon when she started bleeding, following which her boyfriend took her to a nearby private hospital.
The hospital, however, refused admission. He then took her to a state-run medical establishment, where she was declared "brought dead", the officer said.
The woman's body will be sent for post-mortem on Monday, he added.