3 weeks post op 425cc, thought I would be a large D, but I'll be lucky if I am a C cup. Could my peck muscles press them down?

I have 425 cc and it’s been 3 weeks. I thought I was going to have large D but from the looks of it I’ll be lucky if I’m a C. When looking at sizers it looked bigger than where I am now. It’s been 2 and a half week so I know not long, but I’m just wondering if my peck muscles are pressing them down making them look flatter? I do box and workout a lot so would that mean my muscles are pressing them down super hard? Thanks for the answers. This site helps ease my mind!