Don’t wait until you are in a situation where you need contraception (condoms, the pill, the morning after pill etc.) before you think about how to prevent a pregnancy that you or your partner aren’t ready for.
Thinking about contraception before you have sex does not mean you have to have sex but it does mean that if you chose to have sex with a partner you will be ready.
There are loads of different types of contraception – some are more effective than others, some last longer than others, some suit one person but not another person etc. etc. – it’s best to have a read about all the different types and then to speak to a healthcare professional about the couple of options you like the sound of to see which might be the best fit for you – and if you don’t get on with your chosen method (you forget, you don’t like a side effect, you change your mind and want something that lasts longer) then healthcare professionals will always be happy to help you alter your method and make sure this happens without leaving you at the risk of an accidental pregnancy.