I am still 20 n I don't want it like this I'm not ready for this... pleade suggest me any medicine that'll help me to stop it... its urgent

Have you had your pregnancy confirmed by a doctor? If not, how do you know how far along you are?

You need to talk to your/a doctor about your options.

There is no magic abortion pill. If you are not far along your doctor may be able to prescribe medication that will abort. So you NEED to see and discuss this with a physician.

And, if you don't want it or aren't' ready for it then you should not be engaging in sexual intercourse. No form of birth control is 100% effective.