Hello, can you tell me if anyone has experienced something like this? …

Hello, can you tell me if anyone has experienced something like this? I'm 38 weeks pregnant. When I walk, it starts hurting, like a bone in my rib cage, such an intense feeling that the baby is pressing his head down, the pain is sharp and stabbing. It then goes away, like when you have a cramp. I'm afraid that the bones are separating because on the internet they say that during natural childbirth, the bone could completely separate and in the future the person might not be able to walk. Now I'm worried about whether or not this is happening. Because I don't have any appointments with a doctor.