10 days since unproted intercorse..will 1000mg vitaminc a day avoid pregnancy. .. if so please tell me safe pill for vitaminc. .missed emergncy pill :(?

Oops, too late: None of the "emergency" contraceptives will work this long from possible conception. Vitamin c will not prevent conception, implantation, or the persistence of pregnancy. At this point, all you can do is wait to see if a pregnancy test is positive. If so, then you will have decisions to make about the pregnancy. If not, then please consider using effective contraception from now on.