I missed mine when PG with Matilda as I was too scared and then promptly forgot to have it again, so when I went to do my check in at the hospital they asked me & I couldn't believe I had missed 4 years. They said it was safe to do in the second trimester so I had one done then. HTH! I'm sure everyone has different view about it, but as I have known a few women to find out they have cervical cancer in the past year I decided it was worthwhile doing at that time. I had one done at 13 weeks.