negative test....finding out being pregnant

Have any of u had negative test to later having a positive test? I have been cramping on & off, & light on white discharge, no other symptoms. However...my period was supposed to be here the 28th, I'm very regular. But Glow says it be the 4th....but I think that's way to long to wait on a period as well as I know my body & that never happens. I tested today and got this.....hopeing that bad friend (period) doesn't come for another 9-10months but with a positive result😁🙏🏾