Hello Sanjay
This is first time for you and your fiancee , so I recommend oral
contraceptive ( containing DESOGESTREL+
ETHINYLESTRADIOL ) .
How to take these tablet :
Oral
contraception :Dosing instruction may vary according to the brand.
For 21 tablet pack:Start dose on 1st day of menstrual cycle, 1 tablet daily for 21 days followed by 7 pill-free days.
Start a new pack on the 8th day after the last tablet is taken.
For 28 day pack:Start dose on 1st day of menstrual cycle , 1 tablet daily w/o interruption .DOSE SHOULD BE TAKEN AT THE SAME TIME EVERYDAY .
Usually these tablets don't have side effects except minor G I discomfort like nausea,
vomiting, breast tenderness or enlargement or secretions,
depression but these are minor so benefit is more , so your fiancee can take these tablet as an OTC product .
If she feel any major side effect or change then consult a doctor and stop tablet at once.
Hope this will help you.
Now you should wait till 1st day of menstrual cycle and start tablet and free to do sex.
Good luck.