Implant exchange to go bigger while planning to get pregnant?

If you want surgery now, then do it. Not all women gain in size with pregnancy and breast feeding. Some stay about the same and some lose tissue. However, after you have all the children you want, then have something done if needed.

There’s no yes or no answer to your question I had a
The impact of pregnancy on women’s breast varies substantially from person to person.
After pregnancy, some women may need more extensive surgery such as a breast lift while others have breast that are almost the same.
as a general statement, anytime excessively large implants are chosen the chance of undesirable side effects, complications and need for revision surgery goes up.
Without having more information, can’t really give you quality Recommendations.
Best,
Mats Hagstrom MD