It can take a little while for your periods to return to normal again once you come off the pill.
Positions, Some suggest doggy style or man on top positions and once you have had sex, you put your hips on a pillow for 15 minutes so sperm aren't fighting gravity.
Vitamins it's adviseable to start taking Folic Acid when you want to conceive for at least 3 months prior to conceiving and for the first 12 weeks of pregnancy.
Diet, you need a health balanced diet high in zinc (as it helps produce good quality eggs and sperm).
If you're a overweight it can make it harder to conceive also. You can do gentle exercise while pregnant but not anything like sit ups. Hope this helps.