Hello, could you please tell me if anyone has experienced this? It's b…

Hello, could you please tell me if anyone has experienced this? It's been three months since I had my baby, and four days ago, I started feeling a slight pulling in my lower abdomen. I thought maybe my period would start, but no, it's been four days now, and my stomach still hurts like it's getting worse. There's no period, and I'm starting to worry. Should I see a doctor or is there nothing to be concerned about? Could someone who has gone through something similar help me out?