After conception, it takes the new life two weeks to actually implant into the uterus where it attaches and begins to get nourishment from the mother’s body to grow. So, if you partied hard during that time, the zygote (fertilized egg) is not affected. However, this topic is covered in more detail in our blog “Pregnancy, Drugs and Alcohol” under Menu with a link to another medical website for a more thorough answer.