i’m so confused😔

my period came on 7th november, ended on 13th and was way lighter than usual (it was still blood, it wasn’t spotting it was just really light compared to normal) which is strange for me as they usually last about 2-3 weeks and i’m usually ridiculously heavy... i noticed i had stopped bleeding completely around 5pm on 13th, and didn’t bleed at all on 14th. on the 15th i started really lightly spotting like it was hardly there at all, and i’ve been spotting all day today. i didn’t have the usual period pains i would, and i’ve had some light cramps/strong butterflies. the headaches i’ve been having are absolutely ridiculous and i can not stop being sick. taken a pregnancy test a couple of weeks ago and it was negative. anyone know what could be happening or had something similar???😔