Missing pregnancy to the state I want to get pregnant against n 🤕

My baby is 3 weeks old nearly 4 and I feel so sad my pregnancy birth and nearly newborn is all over with now i don't want my baby to grow up 😢😢. I think it's partly because me and my husband agreed two children would complete our family now we have had our 2nd I feel sick at the thought that I may never experience ttc pregnancy and birth again . I also feel guilty and selfish that I'm thinking this when my baby is so new . I love him to bits but i guess I'm just being hormonal 😓