Problem in sum overloaded with array pointers [closed]

I have an overloaded operator + that returns an object of type IntArr, the sum of arrays is done well inside the function but when I do A = B + C the first two elements are not copied, leaving any numbers, why Does this happen?

Thanks

Overloaded function:

 IntArr IntArr::operator+(IntArr A){
    IntArr aux=*this;
    if(aux.used+A.used>aux.size){
        aux.espaciar(A.used);    //espaciar aumenta el tamaño del array
    }
    for (int i=0;i<A.used;i++){
        aux.p[aux.used+i]=A.p[i];
    }
    aux.used+=A.used;
    return aux;
}

Copy Builder:

IntArr::IntArr(const IntArr &arr){
    size=arr.size;
    used=arr.used;
    p=new int[size];
    for(int i=0;i<used;i++){
        p[i]=arr.p[i];
    }
}

Main:

cout<<"\n> Array B\n"<<B;  --> B=[99,1,2,3,4,5,6]
cout<<"\n> Array C\n"<<C;  --> C=[1,2,3,4,5,6]
A=B+C;
cout<<"\n> Array A=B+C\n"<<A; -->da [5298323,6404288,2,3,4,5,6,1,2,3,4,5,6]

Space Function:

void IntArr::espaciar(int cant){
    if (cant>5){
        size+=cant;
    }
    else{
        size+=5+cant;
    }

    int *aux=new int[size];
    for (int i=0;i<used;i++){
        aux[i]=p[i];
    }
    delete []p;
    p=aux;
}

I solved it by overloading the operator = , causing it to make the copy of the other object. In case someone helps you