Some one let me know what you think

Ok I haven't gotten my period my last period was Aug 2-7 2014 and I haven't gotten it again sence I did 2 home pregnancy test and one came out positive the second negative I've been having abdominal pain n I went to the emergency room they did test n said your not pregnant which it crazy cuz I've never been late on my period know I'm becoming nerves cuz it's not normal