Well if you see a barely defined conglomerate of cells as a child, then yes. It isn’t. There is no harm at that point imo. The moment at which this conglomerate becomes something much further developed, this changes.
But even if we’d say that children exist at the moment of successful conception, it is from my point of view much more cruel to force women to carry out the child if they were, e.g., raped.
And that’s just the surface. So yes, I find it much more cruel to intervene with an already existing human’s life than with that of one which is not even fully existing.