Doctor,I have very regular periods and have no complaints about it,my age is 21,I had sex on 5 th day of my periods and also 7 or 8 day...I missed my period..after 7 days of my missed period,I have gone through pregnancy urine test,it was negative and doctor prescribed me sysron for 5 days,will get my periods surely?what should I do if periods still don t come