Stretch marks,boobs,and BC

Okay so I got on birth control the first time when I was 15. I was growing and maturing at that age I know, but with the help of birth control, I went from a small C up to a big DD cup within like a year. Therefore, that drastic of a change in such a short period of time, I developed a shit ton of purplish stretch marks on my boobs. So for this past school year I got off birth control and they went back down about half a cup size. By this time, my stretch marks had faded to like a silvery white color with the help of Bio Oil. Now I’m back on birth control, about 3 weeks in and I’m so scared my stretch marks are gonna either come back or go back to purple for some reason. I know that sounds weird and far fetched, but hormones can do some crazy shit to you. Just looking for some reassurance and thoughts? Thank you ladies ☺️🧡