do-while loop ignores getlin(cin, string) after the first loop

Question

I wanted to create a do while loop, that if the user wants to repeat the action, the program starts again, however after the program is supposed to repeat, the 1. getlin(cin, string) gets irgnored. The 2. getline(cin, string) works fine. It's a calculator that solves terms being put in by the User via getline(cin,string).

 do
{

    cout << "Please enter a term: ";
    getline(cin, s);                   //This gets ignored once repeated
    while( correctTerm(s) == 0)
     {
        cout << "Please only use allowed characters: " ;
        getline(cin,s);                  //This works fine
     }
    term = split(s, ' ');                //splits string into a vector
    cout << calculate(term) << endl;    //prints the answer to the term
    cout << "Do you want to enter a new term?(Y/N)";
    cin >> answer;                   //This works too

}
while(answer == 'Y');