Suggest Remedy For Avoiding Pregnancy After Unprotected Sex

hi. i am un married and sex with a girl and we had done unprotected sex tipple of times but i had drop cum inside her. I was knowing that if i one drop cum inside her then what will happend. But recently i ma not sure she is pregnant or not what precaution we need to stop pregnancy. We are really scare in this situation and we are not ready to take this now. so we decided that we have to stop this pregnancy. My quistion is how to stop the pregnancy? will it possible by tablets bcz it s initial stage only or she have to go through any