Books and Doctors tell you that you can usually start to feel baby move around the 18 to 21st week, but it is not unusual for 2nd time (and 3rd, 4th, etc.... ) Moms to feel movements earlier b/c they know what it feels like.
I would say though that 12 weeks does seem a tad early to feel any movements at this point.
Maybe some of the other Ladies have more advice or better idea's!!!!!!
Congrats!

I believe i was 14-15 weeks pregnant with my third when i first felt movement.

Thanks for the replies, i am not really sure how far along i really am, because i had 6 pos home tests at only 2 and a half weeks and a drs confirmed pos at 3 and a half weeks so to him i am 12 weeks but i think i am further. Thanks for the replies.

My sister felt movements at 14 weeks with number twoso you could well be feeling them because you already know what your meant to be feeling

Ive always learned that you cant feel fetal movement till 16 to 22 weeks. My nursing book says that if you feel fetal movement before 16 weeks its probaly just gas. But i just think it varies from person to person.