Well, getting pregnant at age 30 is not impossible. I don't know what stopped your periods, unless you are quite underweight (often either stress or not enough body fat can cause the period to disappear), but it is not unheard of for a woman who is not ovulating regularly to pop out an egg. If you had sex at around the time your egg came down, there is nothing to prevent you from getting pregnant.
Seven years?? Have you seen a dr??