Help!? Glow says I'm pregnant but HPTs say negative...

I have had some pregnancy symptoms going on the past few weeks. I have had nausea here and there, soft stool and haven't had a real period since April. I've had some spotting in may and some spotting in June (sorry for all this TMI). This got a little weird, especially with the nausea , so I took an hpt on Wednesday (6/14) where I thought I saw a vvfl on the test. I thought I was just imagining it so i took a second on in Friday which came negative, and then a third one on Saturday which also came back negative. I have logged all of these on the glow app and after the Saturday one I try putting negative on it and it keeps saying "congratulations on your pregnancy.." My question is what should I believe and has this happened to anyone else?