No, because there are millions of women who have an unmet need for contraception. You are simply helping them access what they already want. Additionally, having fewer children allows more resources to be concentrated into each individual child, so that they are more likely to receive education and healthcare, and escape perpetual poverty.
Harsh answer:
Africa is simply incapable of handling 4 billion people (forecast for 2100). Already the continent is a net food importer. If they are willing to accept our aid, investment and technology, why should we not expect them to moderate their total fertility in return? By having fewer children now, starvation and destitution is being prevented into the future, particularly as climate change worsens. And what is wrong with pushing our values? As we have seen with the actions of Saudi Arabia and China recently, the West, for all its imperfections, is the best culture that Humanity has available. Generally Western societies are safe, innovative, and wealthy. Why not push the values that make those things possible onto the developing world?
Nothing unethical about supporting a cause where such women can protect themselves from unwanted pregnancy until they feel they are really ready for children.