Faint Positive but AF here, I think?

I tested Monday when AF was due and got a reaaaalllyyyy faint line. But then started bleeding Tuesday so I figured it was my period.

I’ve been really nauseous the last couple days, had heartburn (which I never have), very tired...and just off.

Had a random feeling to take a test tonight and it came back with a faint line right away. Has this happened to anyone? Could I still be pregnant? Any insight is appreciated 😊