Sciatic nerve help


So I became super nervous cause my baby is out growing my body. Next week I will be 6 months and I think I'm big enough but my baby is applying so much pressure to my butt bone. Huge pain and I just found out the marks going down my legs are from my sciatic nerve cause of the pressure and my body not keeping up with growth. Can anyone make me feel better about this problem. It hurts so bad sometimes the sitting and getting up and I'm small. And I already had the shooting pain down my legs. I'm rambling cause I have no idea how to explain this and jut want help. Ladies please help