Its 100% fine to have a smear while ttc, they only touch the cervix not the inside so having a smear will not ruin your chances of getting a bfp. I had a smear while pg i never even knew i was pregnant. When i told my nurse on my 1st ultrasound scan she was shocked i had one done while pg, it wasnt intentional cause i had not tested or due on at the time. Best to have your smear anyway cause if there was somthing wrong then that could be why you cant get pregnant, so i always have my smear's while i am ttc. x