Kazz, I conceived my son when I had a revolting cold (bloody teaching rounds! I always get sick!). I even know exactly when he was conceived - we only DTD once that month because I felt so awful and had to blow my nose ever five seconds. I don't know about flu, but I don't think a slight temperature, aches and pains or feeling hideous is going to affect your chances. At least, I hope not, for both our sakes!!