I had bad pain in the same area with my last one & i was walking 12km or more a day & by 7 months it was very painful.I didn't know about the muscle separation thing i just figured it was my muscles protesting at having my 4th & they were weaker from the previous pregnancies.I had to walk to take my son to school & pick him up & also to do shopping etc so i just used the pain to practice for the birth It hasn't started with this one yet,then again i havn't been walking as much but if it does i might look into the belts the other ladies have mentioned ,they sound like a good idea.Good luck with the rest of your pregnancy