Am i pregnant

I haven't gotten my period since May 25th and I have taken at least two pregnancy test at home in the last two months and they always come up negative and today I went to The pregnancy Resource Center to find out for sure and they basically gave me a test like I did at home so it came up negative and I'm somewhat getting a bit of a belly now and I have had someone ask if I'm pregnant. Has anyone else had something like this happen to you.