Weird Pain at 16 weeks

I’m 16+2 and I woke up feeling weird. I’ve been having pains in my lower abdomen and back. It feels like when I first start my period. It hasn’t gone away today. I called the doctor and she said to increase my water intake, take Tylenol, and take a hot bath. I’ve had two early miscarriages and I’m just so worried I’m losing this baby. Has anyone else had this symptom around this time?