Actually, your extra candles might be a variation on the reason brought by kita ches rebbe.
We add an extra candle as a z’chus that a newborn child should become a talmid chochom or be married to one.
As brought in the Seforim Hakedoshim, getting married is a segulah to have children. You wrote “as a symbol of my hope”, so if you mean as a z’chus, you’re not too far from an accepted minhag.