New to this

I never thought that I would want to have kids. Honestly didn't think it was in my personality. When my husband and I got married we joked about only have dogs instead of children but after 2 years we want to try. I missed my period yesterday and took a test. Expected it to be positive but it came up negative. For some reason my stomach just dropped and I felt a bit disappointed. I expected this to be a bit easier but maybe I didn't put enough thought into it?