Period arrived after putting a test

Well Glow told me I could take a test a day ago but I waited because whether good or bad I didnt want to be distracted from work I had to do - So I decided I'd wait until tonight, well I got my period at work and and feeling very down. I really thought I felt something (not that that means anything)... I'm just so bummed. Don't want this to ruin my weekend/month, but I'm sad :(