Can my gf get pregnant if i cam outside of her and cleaned it all off and then put it backinsideher?

hi im 16 years old (almost 17) and my gf is 15 (almost 16), weve been going out for about 3 months now.. my question is this.. we were fooling around one night andd she gave me an hj.. and i came.. after i cleaned it all up she wanted to have sex.. so i put it in 2 and pulled out and said i couldnt go through with it without a condom.. what are the chances of her being pregnant from that??? im kinda worriedd because this was my first time and i dont want her to become pregnant.. her period should be in about a week from now.. if she is pregnant is there a pill that will prevent it? im really worried