It means you are either having a very light period already, or it is still coming.
If you are using the IUD, have spotting, and have multiple negative pregnancy tests, pregnancy is not a likely explanation.
Me to exalcley...
you could be under a lot of stress and stress can makes you be late on your period.
I would take a pregnancy test, as spotting is very common in early pregnancy- especially at the time when you would have gotten your period. I've been spotting for five days since I should have gotten my period and I tested positive three days ago.
The negative pregnancy test is the defining answer, regarding pregnancy - once your period is a week or so late - if you are pregnant, the hCG will be high enough to be detected.
It may be an ectopic pregnancy
The brown spotting you saw was most likely old blood. Since you started bleeding normally you are most likely not pregnant. Your cycle can shift due to stress, so that might be why you were 2 days late. HTH.
It might be because its to soon for it to show
maybe your pregnant, maybe your period cycle is changing
Spotting alone is not an indication of pregnancy, you would have to have other symptoms to tie it in. It could be a sign of implantation. I would wait for more symptoms or a late AF before assuming PG.
All home pregnancy tests*
You could be pregnant. Take a pregnancy test