Is this pressure when getting up suddenly after lying down a normal part of healing?

I am 6 weeks post breast augmentation. I'm experiencing short moment of pressure when I get up from bed too fast. The longer I lie on the bed the pressure seems to be stronger. My right breast especially. It feels like my implants are dropping down. I have to get up slowly from the side to reduce the dropping pressure or hold on to my right breast. After few seconds it went back to normal. I had 300cc natrelle style 120 under muscles. This pressure only happened 1 to 2 weeks back. May I know if this is part of the healing processing?