Some times in some pregnancy , women’s experiencing that . if it is a dark blood maybe it’s a implantation bleeding , usually they are look like a period but u will may see them for only one or two days, and after that it will stop. 30 % of ladies will experience it , don’t worry , I am 9 weeks pregnant I did not have implantation bleeding but I have those nasty discharges, that is totally normal , because ur body is getting ready for the baby best of luck to u
Brown blood usually means old blood. It could be clearing out from before but then again (and I don't mean to scare you) it could also be your period trying to come. As long as you don't have bleeding (red), cramping or backache then you should be fine. With you being so early, it's really difficult to tell how things will go but I hope your little bean is sticky and you have a great pregnancy!