Girls good morning, yesterday my left leg from the knee down started h…

Girls good morning, yesterday my left leg from the knee down started hurting. When it hurts, tears come out. Who has this pain or what could cause it? My husband says that I gained weight because of this, it hurts. I used to do sports before pregnancy and after giving birth somewhere around 5-6 kg. Please tell me what this could be? Thank you in advance for your answers ?