Your baby will be fine, I quit as soon as I suspected I was pregnant to my first, the smell was revolting, but during my second pregnancy I had a very hard time quitting and ended up smoking for the first eight weeks. All my children turned out fine - that's not to encourage you to smoke during pregnancy!- just follow your doctors orders and take all the necessary vitamins, folic acid, iron etc and you will be ok. Congratulations on your pregnancy.
I don't know if there is a pre natal vitamin with dha here in the philippines
The most important thing is quitting! Good job! Now make sure you are taking a prenatal vitamin with DHA. Drink plenty of water, get exercise...you should be just fine!