About a week ago I noticed a large lump (maybe nickel size?) in one of my breasts. I think it's likely breast-feeding related, but I want to get it checked out.

But I'm not sure where I should make an appointment. I could go to my primary care physician (a family doctor), but I don't know if I'll just need to make a follow-up appointment with someone else. Or I could make an appointment at the OB/GYN practice where I got my prenatal care.

Does it matter where I make the initial appointment?