Will Losing 20 pounds slowly make my boobs saggy?

Im at 140, i was 120 a few years ago. I want to go back. Im 18, if i slowly lose weight, will they become saggy? I realized I have new stretch marks on my boobs meaning the skin stretched and i was like f*ck do I have to stay like this now? Thanks
Update: Background: Ive heard that losing weight very quickly and losing a lot of it can make them saggy, but websites never like to give numbers to "very quickly" or "a lot," is 20 pounds in a few months a lot? i guess that's the question im asking? Lol
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