becoming a father again

i dont no whether  to be happy or sad,,  been seeing this lady for just over a year,  anyway she came home from her work today  and asked me to sit down ,she had something to tell me,,,well jack its like this,  your gonna be a daddy ,  she is 55 and im 65,,  i didnt think this possible,  but obviously i was wrong,,  i blame the viagra,  dont think this would have happened but for taking it,,,,you see i couldnt get a boner  until i took viagra in my later years,  she is over the moon as this will be her first child ,, but i have 10 kids already to four other women,   thinking about just telling her its over,  and go our own way,, i can afford to give her a tenner a week when the kid is born,,  as im paying for a few other kid already,  her sister wont be happy because iv been giving her one as well,  when my girlfriend is at her work,,  im really worried guys,,