Breastfeeding/formula/pregnancy

My LO is 9.5 months and shes been breastfed this whole time, we rarely used bottles because she wouldnt take them.

I am now 16 weeks pregnant and my supply is basically 100% gone 😭 luckily I was an over producer early on so I have a good freezer stash. We are mixing formula and BM together to help the milk last longer. But it wont last until shes 1. But she HATES just formula if it's not mixed.

Has anyone had a similar situation and how did it go? Did LO start liking formula or did you start whole milk early?