can you get a false positive pregnancy test? I took it but saw it was negative and threw it in the…

can you get a false positive pregnancy test? I took it but saw it was negative and threw it in the trash. About 30 mins later I went to throw something and saw a positive so I freaked out. This has never happened to me so I don't want to get excited if it's nothing. I'm going to take another test later one today buy was just wondering if this has happened to anyone.