I’m not sure if I’m pregnant or not!! 🤷🏼‍♀️

Ab

So I’m supposed to get my period tomorrow! I took a pregnancy test yesterday and it was a faint line so it was obviously positive! I then took a test this morning when I got up and it was negative! I had some brown spotting this morning as well as mild cramping and back pain! So I’m a little confused, am I pregnant or was it a false positive? Anyone else experience this??