I have dark brown liquid coming out of my vagina and my period was suppose to be 3 days ago, what can that be? Can it be pregnancy symptom?

Pregnancy test? It's always a good idea to take a pregnancy test if you have had sex and your period isn't normal. If the test is negative (and if your last sex was more than 14 days ago), then you can feel safe. Sometimes periods are irregular for no good reason. Sometimes it's stress, illness, medications, travel, or weight changes. If it only happens occasionally, then i wouldn't worry.