BFP but now cramps and brown blood confused?


Hi ladies, looking for some advise, I’ve done a few tests leading up to my period and have been getting positives with the line getting progressively darker last night I was getting some cramping like AF was coming and today the day AF is due I’ve got some brown blood not a lot but enough. I’m still feeling light cramps. I’m so confused cause I got BFP and thought I was pregnant but not I’m not sure 🤔 has anyone experienced this? Thanks for your help 💛