Welcome to HCM
Saheli is a weekly oral contraception
pill but has to be started twice weekly for 12 weeks and then onward it is once weekly. After the periods end, during the next 7 days, there is no ovulation and hence conception do not occur. The week after these days are the ideal days for conception and then again the week before the cycles not for conception.
As you are having you wedding at the time of your periods have ended, so you can have a safe intercourse without taking any pill however on the 6th day you can start taking it. fix two days a week for atleast 12 days for pill taking days.
Best of luck for your newlife.