Missing Period

So to jump right in I've been really scared lately because I haven't had my period in almost 3 months. Ive taken multiple pregnancy tests over the course of 3 months and they have all shown up negative. I don't feel any different other than being hungry all the time lol I did ask my mom and she said it could be fibroids. I just lost my job and I transitioned into a new part time job so I lost my health insurance and haven't been able to obtain it again because money is tight. So I'm trying not to go to the doctor until I'm able to get health insurance again, but this is really freaking me out. Does anyone know anything about this?