Does Delayed Menstruation And Nausea Indicate Pregnancy?

Hi, My niece, 27 years old,married since 5 years is not got pregnant yet. She tried many doctors and treatments but nothing happend. Recently since 5 months, she was into homeo treatment, but left that also before a month. Now it is 65 days since she got her periods. She visited a Gynecologist and there she did urine, blood and scan. All tests revealed she is not pregnant and reason for not getting periods was PCOs. But since a week, she gets vomits like morning sickness and she is very tired like shes pregnant. Doctor has given her conseval, metival & regestrone,saying she is not pregnant. But she did not take this medicines yet. Is it possible for her to be pregnant, bcoz of the symptoms, she has? Please advice.