Suggestions?!

Cassandra
So I am 20 and lost my virginity earlier in the year. My boy friend and I have only used condoms in the way of birth control since because I was leaving the country for 12 months and the plan was to break up, so we didn't see the point in starting any other conteception that would mess with my hormones if I was leaving in a few months. Well I've moved now and we are still together, I was wondering what the most effective form of conteception would be keeping in mind I am unable to swallow tablets :/ 
Sorry, just realised how long this is but any advice will be greatly appreciated!