I Am Asking About How To Prevent Pregnancy If Theres

i am asking about how to prevent pregnancy if theres any ????
me and my gf were involved in touching each others gential parts..when i relead my sperm on her stomach ( belly part) at that time her vagina was fully covered with her clothes..again later sometimes when she washed away my sperm from her belly then washed her hand with soap and then she washed her private parts ...later 10 min we were again involved where it was only me who was fingering her she...now after that night which happen on 8 nov around midnight...she id in doubt that what would happen if my firgers had some sperm on it when i touched her vaginal parts for second time as i have mentioned earlier....is there any chances of her getting pregnant...plzzz sir anser me as soon as possible ....if yes tell me about the contaceptive pills she would take...can the pills be taken after 15-20 days of that night and what will be the side effects of pills if she consume it and the chances of pregnancy is nil....she was in period arod 25 of october..she hasnt have any period after that .....plzzz reply to me sir