Question...FTM here

Hope • 1st time mom 🤱🏻 with a girl 👧🏻 due on 10-27-2018

So it’s been a while since I’ve been on the app but my baby drinks strictly breast milk. She is not breastfed since I exclusively pump, baby never latched on. She was drinking 5oz fine every 3hrs, but now I can’t even get her to eat more than 3oz every 3 1/2hrs. Is this normal or do you guys think it’s something I’m doing wrong? Baby is 10weeks old.