when soreness occurs, it is because of a build-up of lactic acids.

Soreness.

Injury caused by a blunt object does not usually cause immediate soreness or pain.

Yes, for some women.

i have breast soreness and tenderness , it keeps going on n off ..i think soreness along with darkening of areola is definitely a positive sign of pregnancy

You should obviously have this checked by your doctor as "vaginal soreness" could be one of many things such as an infection or an STD.