However, if you do conceive while taking the minipill there's a slightly higher chance that the pregnancy will be ectopic — when the fertilized egg implants outside the uterus, usually in a fallopian tube. Keep in mind that it might be difficult to recognize that you're pregnant if you conceive while taking the minipill because nausea, breast tenderness and irregular menstrual bleeding — common signs and symptoms of pregnancy — are also possible side effects of the minipill.