I've wondered about this too as I had a colposcopy and laser for CIN2 and CIN3 before I got pregnant with Iz.... I dont think it will affect you TTC but I have wondered about cervix dilation during labour - I had pretty much none and had to be induced, and ended up with a c/s. I know others who have had the same surgery though and have had no trouble so I guess it varies.
Not a huge help sorry!