Baby hasn't popped !

MariasMommy👶🏽👑 • 08.29.13 when I met my King 💯❤️ 12.17.15 when we met our princess 👶🏽👑
My 2 week old hasn't popped all day yet. She was breastfeed until 1-2 days ago I switched her to formula for problems with latching & she had maybe 3 dirty diapers yesterday (they were yellow and soft) but since then she hasn't pooped. What's wrong? I'm a FTM