Pink discharge after sex sooo sorry for the tmi but is it normal?!

[Anxiousally]

Sorry if it's been asked before.
I'm 36 weeks pregnant and have just had sex when I went to the toilet afterwards there was a light pink discharge when I wiped.
Now I'm panicking.
Is it ok or do I need to be calling someone

I've read that a bit of bleeding/spotting is normal after sex due to the cervix being more sensitive.

Plug?