Will my cancer come back after clear mammogram?

Hi I had my Mammogram on September 28 2026 and it showed no signs of Malignant and I was just so elated and at the same time I am thinking will be this be like last time .I was first diagnosed in July 2023 and Started my chemos and keyturda to sink tumor and had my surgery in February and got a PCR .I was not able to do my radiation because I developed Adrenal Insufficiency after my surgery was put in two different hospital and I just didn't understand why they couldn't find out why i was so sick,weak,and barley able to walk went to a bigger hospital and that's when I was diagnosed with Adrenal Insufficiency near 0 cortisol level and had pneumonia also.So I came home and rested a couple of months to get my strength back and wentbin to getbport flushed.Al l was ok until September 27 2025 went in for mammogram and my surgeon found very small spot she did ultrasound and biospy to confirm it was cancer she removed the tumor and some surrounding tissue within 34 weeks and all margins were clear so I did my radiation and started on targerted therapy went back September 28 2026 and was told my Breast showed no sign of Malignant. I will still do my targerted therapy as long as my Echocarigram are ok.Praying for all and God be with us all.