Pelvis pains

Bianca • 26- Registered Nurse- Mommy to a 2 year old baby girl named Avery!!
Hey ladies! So I'm a FTM and this is my second pregnancy, but I didn't make it this far with my first pregnancy and I'm 17 weeks. Has anyone had like constant pelvis pain? Like lower back on your butt kind of pain? It's mostly on my left leg. My mom says it's the baby sitting on a nerve but I don't think the baby's big enough for that. It aches whenever I walk and have been standing for too long. Any advice or experiences would help!