Hii this is liki I wan to conform myself am I pergnant or not
Let me explain you in detail my regular mentrual date is 18 dec and I had sex on jan 12th and 13th and now I d'nt get my date till now is there any chances of getting pregnancy please let me know the ways to prevent it

If you had sex, you could be pregnant. If you don't want to be pregnant, don't have sex.

There is no way we can tell you whether you are pregnant. You will have to take a pregnancy test after your period is late.

If your last cycle was 12/18, then you should have gotten it by now. So if you have, you are late and pregnancy is a probability. But you should wait until the end of January. If you haven't gotten your period by then, you can take a pregnancy test.

It is too late now to worry and try to prevent pregnancy.
When you had sex, what birth control methods did you use?

Condoms ? They have a 2 to 18 percent failure rate but still good for one method
How many months have you been on birth control pills ?
Using both the above is better.

Did they pull out ? Not that it really works well but better than nothing.

After sex did you use the morning after pill (can not use it often so not for regular birth control just emergency)

But yes you could be pregnant, and it appears you are late, When in Jan was you period due. But you wait till 2 weeks after you miss the period and if no period, you do a pregnancy test with the first urine of the morning.