I'm worried..(TMI)

Ok I just found out I'm pregnant with my second Child, estimated I'm at about 5 weeks, and this morning I woke up, went to the washroom and when I wiped there was a little pink on the paper, when I go back to the washroom to check, it's still the same light pink, so I don't know? I should be concerned or go see a doctor or something? Help please :(