No it isn't. It prevents conception. Even the pro-lifers say that life begins at conception, not at ejaculation.That morning after pill is an abortion with a clever name.
Means of contraception have been available for a long time. Would slicker forms make immoral people moral?
Having sex isn't immoral. Having a baby you can't care for is. Most forms of contraception are problematic. There isn't, for instance, a male pill.