Must the first days of Ramadan be compensated for by making up the fast or by feeding the poor when menstrual bleeding continues for fifteen days?

The missed days must be made up before the advent of the next Ramadan. If they are made up, then nothing is due from you. If Ramadan begins and you have not made them up, then if the delay was due to a legitimate Shariah excuse, there is no sin or expiation (fidyah), and you must make them up after Ramadan. However, if the delay was without an excuse, then you must feed one poor person for each day in addition to making up the missed days.