Hello Doctor , I Want To Get Some Information Co\

hello doctor , i want to get some information co\ i came to know with a strange theory which my mind doesn't accept, is there any chance for a woman to get pregnant if she had sex for almost 20/30 days before ? and second thing is there any possibility of getting pregnant just becoz you had a healthy diet and u found sperm inside so they become alive just becoz of ur diet ? am much confused about this theory