Normal or abnormal breast perkiness for a 22 year old female? (Photo)

I am 22, almost 23 years old, and I've always had very perky breasts until the past year. At 19 I had C cups from birth control but now they are down to a deflated B. They were perky until 1 yr ago, they started sagging after I took accutane (it made my skin so thin and saggy everywhere! Has anyone heard of this?) No huge weight changes. I might consider a lift in the future. I don't like implants, I am against them. Would it be possible to achieve small perky B-cup breasts with just a lift?