13 days post op Breast Augmentation, sudden potential muscle tense or implant moved, or maybe normal?

Breast aug 13 days ago. My breasts have been fine, typical itchy, muscle spasm,today i noticed the top part of my left breast is firm, (feels like the muscles are all tensed or maybe implant has moved?) a tiny bit tender. Finding it hard to sleep on my back all night, so rolled onto my side for a while, wearing the post op bra. I have 400cc silicone, high profile, dual plane. Breasts dont look out of shape at all, but the spot is slightly warm, Reassurance or suggestions very appreciated! Tara