No, that would be a bit exteme and besides, there are far more serious pollutants to worry about than those on non-organic food, air pollution and car exhaust fumes for example!
If you are worried, certain fruits and vegetables hold on to pesticide residues far more than other, things like berries, carrots, celery, potatoes, peppers, spinach, grapes, peaches/apples/necterines all retain pesticides more than other fruits/veggies, so it might be worth buying these organic if you feel strongly about it. Other fruits and veggies, such as sweetcorn, peas, plums, tomatoes, cruciferous vegetables etc don't retain pesticides well at all, so I personally woudn't bother buying organic.
Another thing to remember is that organic food has much higher levels of bacteria (due to the no pesticides) and some bacteria should also be avoided in pregnancy. If you are buying organic,make sure you wash very thoroughly, but then the same goes for non-organic. Swings and roundbouts really
.
Personally I'm not at all strict about buying much organic food, sometimes I do, sometimes I don't. The levels of pesticides which are retained are so minute that I don't feel they're worth worrying about, and they have all been safety tested for many years.
By the way, I'm a crop scientist so I'd like to think that I have a pretty good knowledge of pesticides and residues 