The Doctor is aware that i am pregnant but i got the letter just before i found out and i forgot to ask at my appointment. I have spoken to the doctor today who said i will not be able to have a smear until 3 months following delivery. I am to see the midwife on the 15th.
When my sister was 6 weeks pregnant a docter gave her a smear i dont know if that was the cause but she lost hers 2 weeks later so all i can say is ask but if i was you i wouldnt have it until after.
Its fine to have smears during pregnancy, I was under the hospital for treatment of abnormal cells, they did a smear at my last appt just to check everything was ok.
I told them I was 6 wks pregnant and didn't want a smear - I thought they were just looking but they did the smear, results fine and very healthy 2 year old!
If it concerns you though and you have no history of abnormal smears I cant see it hurting to leave it until your 6 wk post natal check up.