Has anyone had butt & lower back pain starting in the 1st trimester? Honestly, my entire left side feels like I got hit…

Has anyone had butt & lower back pain starting in the 1st trimester? Honestly, my entire left side feels like I got hit by a truck. I started getting a sharp pain about 3 inches to the left of my sternum & 1 inch below my collarbone a few weeks ago that I dismissed as a muscle strain. Then 2 days ago my knee became so painful that I haven't been able to stand for more than 5 minutes since, but, again, I dismissed it... this time to weather changes & an old knee injury. But yesterday I noticed I can't bend or turn without extreme pain in my left side & it feels like I'm constantly clenching my left butt cheek. I've been taking Ibuprofen for a few days & none of it is getting better. I know sciatica can be an issue in pregnancy, but it hurts everywhere EXCEPT where the sciatic nerve runs. Please tell me someone has experienced this in early pregnancy & can fix me. My hubby is going to be out at sea for all but 6 weeks of my entire pregnancy & I'm already completely useless. I have an OB appt Wednesday, but I'm dying over here in the meantime. Tips?