Hi ladies pls help me.

I usually have regular period but this month my period was 7 days late. On 6th and 7th day of missed period, i took hcg test and both resulted negative. Then, i got my period on the 8th day, the blood started with brown then now it's red and heavy. I took another test today and there was faint line within 5mins so I'm not sure if the test is right or not. Could it be evaporation line? Mind to know that i had a mild to severe cramp since the first day of period until today (3rd day). I don't know and can't differentiate whether i'm currently pregnant, or having impantation bleeding, or maybe it's chemical pregnancy? I'm gonna retest in 2 days. Any thoughts?

P/s i'm sorry for the TMI but is it my period or pregnancy bleeding?

Faint line:

1st day of bleeding:

2nd day of bleeding: