Hi there, this is my first pregnancy, and I'm 20 weeks today. I just went to the bathroom and wiped ... and there was a small spot of blood (smaller than an eraser tip) on the tissue paper. I'm stressing out.

Is this normal? Do I need to call my doctor?
Re: 20 weeks ... and a spot of blood :(
ETA: otherwise, I'm with sharkfarts. My doctor wants to know about any blood, especially if accompanied by any other symptoms (pain, etc.)
DH: 29
DS: 18 months 4/2/2015
Baby #2 EDD: 6/1/2017