I can´t get abducted

I'm not sure why, but cheating abduction has always been hit or miss. There are some mods out there that increase the incidence of abduction as well as one that makes female alien pregnancy possible (I have that one). If you've tried tons of times and it still won't work, I suggest making sure your Sim has the knowledge aspiration and getting the reward that allows you to summon aliens. You can always change your Sims aspiration later if you don't want to keep it. If it isn't abduction you are wanting per se, but an alien baby, I suggest using the tombstone of life and death to make your Sim alien pregnant.