Hi, My Last Period Date Was 28th August,till Now I

Hi,

My last Period date was 28th august,till now i am not getting my period.i've checked the pregnancy test thrice.On 2nd Oct,6th Oct and 16th oct respectively.All of the times it came negative.Now my doctor said to take regestrone for 3 days(2 tablets per day).Will my period come after 3-5 days?What should i do?Plz help.M really worried.

Thanks in advance!!