How many days does your spotting lasts?

Hi mommies, i am 5w 6 days in and just went to my ultra sound few days ago thinking that i am 7w (my periods are extremely irregular) so there’s GS however no visible yolk yet! I have been having dark brown spotting for 3 days with a stringy clot but not too much. It’s very small and only when i wipe! For the peace of mind, how many days do your spotting lasts and is it normal? I am trying not to stress myself out! It’s my first time being preggy.