It depends, I have slight pink blood after sex or when I workout because you've iratated the uterin wall. It'll probably continue to happen throughout your pregnancy it's not uncommon.
For how long is this normal?
And thank you for the comment
Your fine momma, brown blood is old blood and the light bleeding that's pink is nothing to worry about I'm 11 weeks and ocasionally have light pink blood in my stool if I've worked out or over exerted myself.