Start of capsular contracture or muscle strain?

I’ve had my silicone implants for 2 years. I went to the gym 3 weeks ago, did lat pulldowns & now have muscle spasms in my right breast. It’s not painful, just more annoying. It feels as if the breast is contracting or “flexing” by itself. It also gets worse when I drink coffee or anything to give me energy. My regular Dr (not PS) gave me muscle relaxers & I’m still having the spasm. The breast is not hard and looks normal. I had an ultrasound done & they said it looked normal. What should I do?