Age 17. Will my breasts ever get bigger?

Your breasts may continue to grow, however losing so much weight may unfortunately has had a negative effect on their shape and size. Sagging tends to get worse with age and further weight fluctuations. Keep in mind that if your breasts do get bigger, they may get saggier as well. 

Is "unpleased" a word?  I don't know.  I'll have to ask my kids.  Anyway, your breasts are subject to change based on a lot of things - weight loss/gain, periods, pregnancy.  Some women can lose 4-5 pounds and all of it is in their breasts.  Some can lose 20-30 pounds and none of it is in their breasts.  You know how your body reacts to weight gain/loss better than anyone.  Breast implants will add volume to your breasts but they will do nothing to correct sagging.  For that, you would probably need a breast lift.  The downside to a breast lift is that it requires more scars on the breast.  Finally, although it is kind of an arbitrary number, most women have reached their adult breast proportions by the time they are 18 (some earlier, some later).  When you are ready to address your concerns about your breasts, I would suggest seeing a board-certified plastic surgeon who can examine you in person and discuss your options more specifically with you.

In the occasional female breast growth may begin significantly later than the onset of puberty. Time will tell. Breast augmentation is a very popular solution for women who want larger breasts.