Im 22. my breasts recently grew a cup size although ithought they were done. will they grow more? im not overweight; ive always been healthy & lean

Breast growth: This depends somewhat on when you went through puberty & started menstruating. Some women can still experience body changes into their early 20's, especially if you started your period late (~15-16). This could also be caused by weight gain, but you said you have not gained weight. I would also recommend a pregnancy test, since pregnancy can cause breast growth.

There have been: reported incidences of women on Zoloft gaining breast size. This is not a common reaction but it does happen. And not many scientists or doctors can explain why. But it seems to be related to your taking Zoloft. Here's a short article you can look at: https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.158.6.967