Confused?

So ive recently finished my monthly cycle, around 6-7 days ago. Myself and my partner have been having intercourse since, using the 'pull out' or 'withdrawal' method. This evening I've gone to the bathroom to find that i have a tinged pink discharge - what could this mean?

I had a csection 3 months ago; could it be related to that?

** i know not everyone will agree with the methods we're using but please reframe from nasty comments **