no line progression 😥 what does that mean

what would be the explanation behind starting with vfl on 4 different pregnancy tests but no line progression if anything they keep getting lighter

my period was on february 10th but then on my predicted period on march 16th i bleed for 4 days instead of my usual 7 days it wasn’t implantation bc it was normal heavy flow

until after the bleeding i was nauseous for a weak straight super hunger felt hot at night and can’t sleep and needing to use the bathroom loose stool and constipation and mild cramping

till now i’m feeling all these

so i know it’s not miscarriage or chemical pregnancy bc i don’t feel pain in my abdominal or bleeding or pain