Baby number 1!

I'm 19 and currently trying to conceive baby number 1! My fiancé and I have been trying for the last 6 months or so. Ever since I thought I was pregnant in September my mom has been excited and pressuring us to do everything possible to get pregnant. I hear "I want grandkids sooner rather than later" on a daily basis now. It completely discourages me to see negative test results month after month and I know my mom feels let down too. I feel so bad.