18 weeks and miscarriage ?

Ay

I know this is a touchy subject for most, if not all who’ve been through it but I’m really freaking out. I’ve been having EXCRUCIATING lower back pain and cramping. I’ve also been bleeding on and off. I’m 18 weeks. I have an 8’month old daughter who was born via c section. Do you this is why I’m having these pains? What were your symptoms for your miscarriage? I’m on my way to the hospital now.