Can A Sudden Work Out Cause Calf Pain ?

I am a 32 yo woman, don t exercise a whole lot in a structured way but have a a preschooler and a baby so on the go a lot - anyway, after working out 2 days ago on the Wii for the first time in a while ( Walk It Out ), the backs of both my calves in the middle are hurting quite a bit when I walk. It is worse today than yesterday and I am having to walk on my heels to avoid pain. The area is also slightly bruised on the right side. Is this just soreness that will go away or have I injured them somehow? Do I need to see a doc or just the usual RICE advice? If it s an injury, what is it likely to be that causes pain in the mid-back of calf and causes painful walking but I can still walk ok on heels - a stress fracture, tendonitis, strain or something else? (The exercise I was doing was walking fast to a rhythm, almost like marching, for about 30 minutes in socks on a carpeted floor). I have a possible connective tissue disorder (EDS or hypermobility syndrome) but not sure if this relates at all. Thank you for any insight.