Fast result workouts?

Amber • 19 been with my fiancé for two yrs. pregnant with our first baby! Due febuary 27,2015!!(:
Do any of you ladies have any workouts that show fast results? I am looking to get back into my workout routine and I am in search for a routine that will show some pretty fast results. And if you have any healthy diet tips or anything like that feel free to share (: Thanks!