Trying to conceive for baby number 2 at 19

Breanna
So I had my baby 5 months ago, my fiance is 6 years older than me and has a 4 year old son. I'm feeling so defeated... every test that is negative makes me wanna cry.... Why do people get pregnant when they don't want to and I can't get pregnant even though we really want another one soon 😣😣😢😭😲