Baby only feeding from one breast

My daughter is 5 days old, out of nowhere (started last night) she will no longer feed from my right breast. She will not latch no matter how hard I try or how many different positions I try. I’m not giving up and I’m still offering it to her first with every feeding. In order to keep up my supply I have been pumping on that side because i don’t want it to dry up. Any one else ever gone through this? If so any tips?! Is it just a phase? I’m a first time mom so this is my first time ever breastfeeding.