Pregnant and need someone to talk to with experience and advise?

ok i am going through a really tough time and unsure on what to do. i found out i was pregnant on sunday and unsure on what to do. i didnt want this pregnancy to happen. when i had unprotected I bought the next choice pill but obviously did not work. im about 3 weeks preggo. i made an appointment this saturday to have an abortion but i get so teary. whether i keep it or not i feel afraid and i dont know why. i know this is a life changing experience. but would it be for a better change? how do you(mothers) feel? i know it must be a beautiful experience. please maybe we can chat and help me decide on what to do. by the way im 22 and he is 36. the father saids he will help me..he actually planned for this and wanted this without caring how i feel about this whole situation.