Teenage girls at 14 weeks pregnant woke up in the morning and was scro…

Teenage girls at 14 weeks pregnant woke up in the morning and was scrolling through her phone. In one moment she noticed discomfort ? inside some sensations were not right … anxiously … suddenly the abdomen became hard in the middle, soft on the sides straight across hard? What could it be? Could it be the head and back? It's located still on the front wall of the uterus, maybe someone had this experience, but there is no pain and no discharge.