What’s going on?

So according to this app my period isn’t due until the 9th which is this coming Thursday yesterday morning I woke up and had blood when I wiped and thought must just be my period starting early so popped a tampon in and went about my day about 4 hrs later went to change and nothing but a brown spot then nothing for rest of the day now nothing when I wipe and my cervix is high and closed 🤷🏻‍♀️ I thought that the blood that was there in the morning was so heavy and red for implantation but now I’m confused anyone had anything similar