HER2 positive complete P response after 4 rounds

Hi, I was diagnosed with HER +ve in my right breast (17mm). Grade 3, invasive, Grade 1 in my left breast HER -ve (15mm), My treatment started in October. it was 6 rounds of Docetaxel and Carboplatin, phesgo every 3 weeks and zoledronic acid (every 6 months) …it was brutal. The chemo was very harsh and not to go through all the side effects but I have never managed the 3 weeks, due to low neutrophils, only every 4 weeks. I had a CT scan and ultrasound this week and the good news is I was told I’ve had a complete pathological response and there are no signs of either tumours! Horay! No residedue…nothing… I was astonished. I am supposed to have 6 rounds of chemo. Does anyone know whether it is possible I won’t need the last two doses if I already have a CPR? I am having a double mastectomy due to having the PALB2 mutation, so not risking a lumpectomy. I know I will continue with part of the Phesgo (can’t remember which half!). Has anyone had a similar situation? I really wouldn't want to continue with chemo if it's not needed!