has this happen to any of you girls

Silvia
Hi I'm 24 years old and I been trying to have a baby Month by month I would start my period but I haven't started since April at first I thought I was pregnant but I keep taking test and they come out negative I made a appointment already but they won't see me till this Friday coming up has this happen to any of you girls I'm just worry if my test are negative then what could be wrong with me