HI hun i’m the same, i had 1 bigger than the other to start, had 2 different size implants. One is still slightly bigger than the other. I had my 6 week check last thurs and spoke to surgeon about this. Its all normal, they class it as 2 different operations, so one will heel quicker than the other, the one that had the least breast tissue, which is my smaller one will take longer to drop and settle, but he says it should catch up with the right side and even out, it could take quite a while, could be a matter of a couple of weeks or even months.
Try not to worry about it huney, they should even out fine, just may take a bit of time x x