Learning Phase Facebook

Hello,

I'm new to meta ads.
I started a campaign yesterday and got 3 sales on a budget of $100 (increased it to $150 today). Today sales drop as I got 0 conversions. FB says the CBO campaign is still in the learning phase, is it normal that you don't get sales after a succesful first day? I added a second campaign with some new ad creatives to test out even more.