Bfp then bfn the next day?

If someone could help me that would be so great because I’m an emotional wreck.

So yesterday morning 6/1 I took an hpt from the dollar store. After about three minutes it was positive but a faint positive. I thought OK well I am just going to test again tomorrow and the line will probably be darker.. however, when I tested this morning I got a BFN...

It is still m early as I am only about 10 DPO but if I got a positive yesterday why am I not getting a positive today…

Has this happened to anyone else? Could I still be pregnant or???

Help..