The implants themselves will be fine — even as breast tissue grows and changes with rising progesterone and estrogen levels during pregnancy.
“Breast implants are designed to be resilient and resistant to deflating, ruptures, and leakages,” explains Dr. Samuel Lin, plastic surgeon and an associate professor of surgery at Harvard Medical School. “The pressure caused by growing breast tissue is very unlikely to cause implants to rupture and change shape.”
However, the changes in your breast tissue, coupled with natural weight gain during pregnancy, can sometimes weaken breast tissue because your breasts expand, then contract. This can make them change shape or sag for some people — though not everyone — which might change the look of your breasts even with implants.