Biopsy showed breast cancer. I’m 35

Hey, I have recently been told a lump found on a breast biopsy was cancer and the report says breast tissue infiltrated by invasive ductal carcinoma exhibiting grade 1 and grade 2 patterns and given an overall grade 2 and a solid intermediate grade DCIS. Due to have mammogram and MRI tomorrow. Has anyone been in the same situation as me? I can’t eat or drink, I’m filled with worry that it’s spread or in other places. Ultrasound showed no changes to lymph nodes in armpits and other breast had no unusual lumps but you just never know. I’m so so nervous about the other tests tomorrow :(