Any other women experiencing implant difficulties?

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I got sub-muscular breast implants in January of this year and I was told not to exercise for 6 weeks i think? and I remember returning to the gym too soon and experiencing severe pain and swelling. I have only recently, as in the last 3 weeks, started to exercise regularly again, 6 days a week. And now I experiencing mild swelling and tenderness. It has been almost 8 months so i don't think it's a surgery complication. Could it just be that I'm exercising my pectoral muscles more than normal and thus they are getting sore just as your legs or arms would? Can any other women with implants tell me if they still experience these systems while working out?