my period was 4 days late when i started bleeding. it was super light and only lasted one day. there was barely any on my pads (looked like 3 drops at most) and it was brown. could this have been implantation? i read it could be breakthrough bleeding but i have no idea what that is.

i took 3 tests beforehand and they were all negative.

i could have sworn this was my month. i had all the symptoms (i usually don’t have any with my period) and i just had a feeling. thought ?