Your plastic surgeon should be signed out to another plastic surgeon for coverage. You should be evaluated for the presence of a hematoma. CAll you surgeon's office and ask to be referred to a covering surgeon for evaluation.
Don't get your self crazy about the abnormality you have discovered, A good friend of mine had just had a breast augmentation about a month ago and only two weeks later she found a peculiar lump above her right breast, Thank God and everyone else...it was nothing! Yay! I think because of all the million side affects that could possibly happen we tend to look out for those rather than everything being great? I guess thats humans for ya? Btw....In about 4 months I'll be getting the surgery myself. I sincerely hope everything is as great with you; as you as you planned it to be.!