sex during possible implantation?

Laura
Hi ladies - just wondering what people's thoughts are about sex during the tww.  I'm now 7 dpo and my hubby and I had sex - me on top.  I'm worried that I might have interfered with implantation... if there was a fertilization.  I had very very slight pink(ish) discharge when I went to the bathroom after.  It was not pink spotting - I've had that before with my last pg that ended in mc.  This was much less pink.  I'm really upset with myself if I possibly ruined this cycle.  Any ideas??