Hi,My Name Is Karthika,I Have Not Got My Periods Yet

Hi,My name is Karthika,I have not got my periods yet and also have doubt whether I am pregnant so consulted my doctor and took scan which shows cyst in left ovary so my doctor suggested me to take Naturogest 100mg tablet as not sure whether there is pregnancy possible and asked to wait for 2 weeks and medicine given for 5 days.Finished my medicine now.If I am pregnant how can I know it,If not when will my period comes