Please help!

I'm 15 weeks tomorrow with rainbow baby twice over. I started getting some mild cramping about 10 am yesterday. I took a warm bath and relaxed, napped, and just took it easy. Woke up this morning with pain so unbearable I couldn't hardly walk and wanted to throw up. I called my ob and she said for me to go to the er. They took my vitals and gave me 1000 MG extra strength Tylenol and started an iv. The Tylenol has been the only thing to help relive any pain, but I've been taking the same thing at home and it hasn't touched it. It's almost 48 hours later and I can hardly walk because the pain is so unbearable. The hospital thought it was round ligament pain, but surely it doesn't last this long, stay constant, and get worse as time progresses? If anyone has anything that might help or answers, please let me know. I'm beyond miserable.