frustrated

Hello! Just want to hear from people who might have similar stories and their outcomes.  I've posted previously that I had 2 positive pink dye pregnancy tests 6 and 7 days before my missed period and even a positive digital test 5 days before my missed period.  I started to have brown spotting Saturday and today.  I've already been through a MC at 12 weeks so was really hoping it was our time this time around.  I took a pregnancy test today to see if the line was getting darker and it was negative 😞 was this a chemical pregnancy? My period is suppose to start tomorrow.  Feeling confused.