Confusssed

I don’t have the pic of the positive test.. anyways. So last night I took a test and it was positive. Like actually positive and it came up within 5 mins. I took two more this morning and they were negative. Then this one close to the same time I took the positive one. And it’s negative. The positive one was a 6 hour hold, the rest have been 4 hours. I can’t hold it longer than that I’m confused and want answers so bad. But the thing is. I stopped taking my birth control about three months ago and haven’t had a period since. I don’t think I’m pregnant but has this happened to anyone else????