P.M.
All women have uneven breasts. Pregnancy and breastfeeding temporarily exacerbate the problem. On top of that, the baby will inevitably prefer the bigger breast as their favorite, which may make the issue worse. You can always pump extra from the smaller breast to see if that helps.
Your husband will not care or notice this... women are ALWAYS more critical of their bodies than the men in their lives are. Enjoy having bigger breasts!!