Can I lose 3 Kilos in 2 weeks?

I'd say if you have to resort to a diet plan, better eat two meals a day, a good breakfast is a must and an early dinner around 6 PM, try taking something light and healthy in between something like a fresh Salad of fruits and Veggies around 1 AM, increase your water intake specially in summers, Do not drink water after meals at any cost, try to drink un-chilled water as a habit. And do try to take some green tea before going to bed everyday. Go to bed early so that you dont feel an appetite because of an early dinner.
Speaking of Abs, you can start with an exercise that we call the Sit-Ups, as a beginner lie flat on your back, cross your fingers behind your head and try raising your head+shoulders up and forward, as far as you can, this is best done with knees bent but that requires a partner. Start with a set of 10 repetitions (or as much as you can do easily) if that aint too much, try to do 5 sets with an intermediate gap of 1 to 2 mins.
The thing about exercise is one needs to be regular to see the difference. Do this exercise atleast twice a day. Not immediately after meals though :p

Hey, this question might give you some tips :)
http://jawab.pk/q/what-is-the-best-way-to-loose-weight-the-pakistani-style/75

o khuda ki bandi.. underweight BMI and still wana loose weight!!.. is it a case of anorexia nervosa (in which denial is the first stage :P)...
start getting in shape. do some gym shym, aeropbics, get yourself toned up. youll feel far better.
nobody likes teeli pehalwan. and its dangerous for your health to be one too.

besides.. 3 kgs in 2 weeks is next to suicidal. i would say even 2 kgs would be way more than enough. and for you... dont do it!.. BMI can be misleading though so even if you have decided you need to drop weight, do so with caution.

and NEVER and i repeat NEVER starve yourself. eat to the full, just change the menu if you want. read my post on the link Usama hafeez has provided.. i'll just repaste it here http://jawab.pk/q/what-is-the-best-way-to-loose-weight-the-pakistani-style/75... its tried and tested. add moderate and regular exercise to that and it should produce even better results

3 kilos in 2 weeks with an underweight BMI? hmmmmmm. dangerous.
and you're just 52 kgs. i am 53 kgs and people around me call me thin already.
if you think you have a big tummy, try doing situps.
but please, don't lose weight per se.
you just need to shape your tummy, that's all.
dont be too pressured to be thin. learn to see the beautiful parts in you if other parts of you make you feel bad about yourself. because surely 52 kgs is average, A-ok.
how tall are you?

I will suggest you to not go into heavy exercises as you are already underweight. Just control your diet by adding more vegetables and salads, increase your water intake, divide your 3 times meal into atleast 6 times ( that way your body dont gain weight) and yea try to walk for atleast 30 mins daily ..
I hope it helps :)

Yes, you can lose 3 kgs in a week, I have a diet plan that can help you BUT I dont personally like,
Banana diet it is called, you are suppose to take banana and slimmed milk ONLY for 6 days, no other stuff except the water of course. That actually helps to lose weight but I wud suggest you to not to go on crash diets. instead of that, just cut down rice, sweets and oilly stuff from your diet with some exercise or walk wud be better, this is gonna take 15 days but wont make you weak like crash diets make you.
See if this helps http://www.youtube.com/watch?v=gEieBTukVM4 or you can search such exercises on utube
Good Luck : )

If you are Pakistani, you can't loose weight. :)
One can loose weight by jogging and reducing meal up to 50% and finally be consistent.