Oncotype testing

Hello everyone, I had a double mastectomy with Sentinel Lymph Node biopsy with expanders on 24th August. ER+ PR+ HER2-. Pathology shows clear margins and cancer not detected in Lymph Nodes.

Left Breast -DCIS of low and intermediate nuclear grade.               

Right Breast - Multiple foci of invasive carcinoma LCIS. Six foci of grade 2 invasive lobular carcinoma and a 5mm focus of grade 1 invasive carcinoma. Extensive classic LCIS.

I mainly have one question, and I am hoping you can all help me. This diagnosis happened so quickly it was like a whirlwind. Between diagnosis and surgery, I was overwhelmed with information and decisions that needed to be made. At that stage I did not even know about Oncotype testing. 

My question is can I still request oncotype testing 3 weeks after my surgery? I feel silly that I did not know about this and therefore request it.

Any advice is greatly appreciated.