Dear Doctor,I am 28 years old and 6 week pregnant,i have back pain nausea and vomiting since 11 th october,2015.Two days ago i went to hospital and do ultrasound ,doctor said report is good ,6 week pregnant,and she suggest Tab.Duphaston 10 mg(dydrogesterone 10 mg) twice a day.when i started this medicine i got severe vomiting and legs pain....so next day i take this medicine once in a day and now my feel is ok....so i want to know this medicine is enough for me once in a day? or i need to take twice? i don't have any bleeding and this is my first pregnancy.