Back pain!

Hi Ladies!
Anyone else's most prevalent symptom back pain? I have barely any nausea and and my breasts are barely sore but I have constant a constant back ache, laying, sitting, standing! Last night I felt super crummy with my back, a headache and very light nausea. 5 wks 5 days. First ultrasound on Wednesday when I'll be 6 wks 2 days.