Talk to Gynecologist on Pregnancy Related Query

Assalam o alaikum! mai ne apny periods miss kiye then i did urine pregnancy test by myself which comes out positive so i visited dr and she did ultrasound and said there is nothing and gave me folic acid and duphaston 10mg. Can i take duphaston? for how long? cuz unho ne to kch b ni btaya ktni dose leni daily or kb tk. Any other medical advice?? Actually its my first time so i have no idea or koi guide krny wala b nhi..