Sorry to jump in on your post but i thought i would give you my story.
I had 2 lletz, first one in Jan 14, second in March 14 which came back with clear margins. I fell pregnant in the May and now 33weeks, i did have to have a smear in July as part of my 'check up' which showed severed changes apparently which lead me to have a biopsy taken. This is not pleasant in the normal circumstances but being pregnant is worse, luckily i had already had a procedure done for a cervical stitch as my cervix was very short. There is a small risk of going into labour when having a biopsy, this didnt happen to me and the results came back as minor changes CIN 1 so was left alone until i saw a consultant the other week who said from what he could see everything looked fine and would review once baby is here.
It is a very stressful situation being pregnant and having a letter stating that severe changes had been found, they do say that you shouldnt really have a smear while pregnant as it can show up false CIN because of the changes that happen anyway. Always get checked if you are scheduled for a check up just to be on the safe side, but there is no reason apart from your consultant that might say you shouldnt just yet (advised me not to get pregnant until i had a clear smear whoops!).
If you have had procedures done, find out how much cervix was taken away as you may also need a stitch put in to help keep the baby in :)
Any questions please get in touch, good luck with TTC.