Hi Stella!
Welcome to the forum and to the mystical world of growing boobs!
What you are taking is pills that contain a mix of different ingredients, usually concentrated, that are less effective than PM alone.
When you read dosages in multiple of 500mg, that usually refers to pure ground PM. The brand many here use is Ainterol (ainterolherbs.com) but there are other companies offering similar products.
It has been discussed many times here that taking a mix of estrogenic substances (i.e. PM and Folic acid) is less effective than taking a strong one alone, and for what we know, PM is the strongest out there.
Depending on how committed you are to breast growth you can decide to keep taking those pills or to order pure PM. Anyway, those pills will give you a tiny bit of a start, so it's not bad if you take them until you get pure PM (if ever).
Good luck!