Ejaculation outside vagina is called coitus interruptus
and is definitely a way of avoiding pregnancy
but it is not 100% effective though a good way as some risk of getting pregnant is still there from the secretions of male released before ejaculation during the act and it does contain few sperms.
Intercourse during 14th day is definitely risky especially when done without any protection as its a very fertile period of a female. To avoid pregnancy from any unprotected intercourse
during this period, you can use emergency contraceptives like i-pill tablets or unwanted-72 tabs( which contain 1.5mg levonorgestrel
) . Single tablet is taken as early as possible following intercourse preferably within 72hours (3days) of intercourse. Further delay in taking the pill doesnot ensure protection.
Now if you have symptoms like nausea, weakness etc which can be symptoms of pregnancy , i suggest you take a urine pregnancy test before using any medicine. This is because if you are already pregnant , the above mentioned tablet wont help you in anyway and for that you need to see a doctor for abortion
I would have advised you better if you had mentioned your last menses date.