So frustrated please help

So lately I've been having extremely bad back pain whenever I do too much moving around and walking throughout the day. It's a constant ache and if I keep trying to power on through it, I end up barely being able to walk and move without almost screaming in pain and being paralyzed from pain. The nurse I messaged is trying to say it's round ligament pain which I do not believe to be true with how much pain I'm in constantly and it doesn't ease up at all and it's not my stomach area at all, it's my back and it shoots down thru my legs and gets worse with exercise and I'm just extremely frustrated with that nurse right now and wanna see what you ladies think? Should I message back somehow saying no that's not possible its gotta be something else or just let it rest? I'm honestly losing my shit from the pain. I'm 14 weeks only and this same thing happened with my last pregnancy and they just blew me off basically but this time it's starting extremely early and worse.