How long does it take till you know your pregnant but you have never had your period?

Two things- first one is that if you've never had a period the chance that you're pregnant is relatively low. But... if you hit your 1st ovulatory cycle right around the time you had sex it is possible (which is probably what you're wondering...) You may start to see things like light spotting around 5-10 days after you had sex. It is normally painless. 14 days after you had sex you can use a home pregnancy test. Other things you might be feeling is a fullness in your abdomen, increased breast sensitivity and/or size, and maybe a little more emotional than normal (I cried about chicken). As a side note, you sound pretty young. Do yourself a favor- if you aren't pregnant take a break from sex for a few years. There's a lot of consequences- the least of which is a pregnancy (that's survivable and babies are adoptable). Not everything is- you can get your heart broken or extra wrapped up in a guy that isn't good for you, the worry of being prego, and STDs that can permanantly affect your life/fertility or even kill you. And if you are pregnant- congratulations! Get thee some prenatal vitamins and in to start prenatal care.