Abstinence is the most effective form of birth control.
You can consider inserting an intra-uterine device (IUD). It's close to 100% effective and lasts up to 10 years.
http://sg.theasianparent.com/ways-to-prevent-pregnancy/
Not 5yrs for iud?? Isit painful down there
Can we still active with all those normal activitues
Agree with Jamie. Abstaining will be the cheapest (no cost) and there wouldn't be any pain coz.. nothing happened.
Otherwise, you can take birth control pills which are prescribed by your GP.
Efa Izumie