Strange Sensations 6 Years After Breast Implants, What's Causing the Feeling of Fluid and Pressure?

6 years ago I had saline breast implants over the muscle put in, in the past year I have felt what seems like fluid and air underneath my left imlant. When I put slight pressure on it and push it to one side i feel sort of a gurgling and a slight pain ( on a scale of 1 to 10 its like a 1) My breast hasn't gotten any smaller so i don't think its a leak, my breast doesn't feel any harder or softer either. Should i be concerned? Thank you