I smoked until I found out I was pregnant. I was totally stressed out and scared too, because it was unexpected. I tried cold turkey, but it didn't go well with the extra stress. I was super excited and happy about the baby but money was tight and I was worried.
I ended up buying one extra pack. What I did was allow myself to have 2 cigarettes a day at first, then just one. Knowing I could have that one or two cigarettes made it easier to get through the cravings. And I did not let myself smoke them at all my "usual" times. Like in the car or after meals, when I would normally want them. So I was breaking the habit part of it while still allowing myself a little bit. I would have that one allowed cigarette at a really odd time, making myself go out of my way to do it. Or if I was having a lot of anxiety at that moment.
I started being able to wait it out, because I wanted to still have my one available to me later if the anxiety was even worse at that time. So it was helping me learn to deal with the anxiety on my own, without nicotine to help. Pretty soon, I found I didn't need them near as much. I have always had issues with anxiety and was never able to quit before because of it. Then, once that last pack was gone, I just took it easy for 3 days. The first 3 days is the hardest, after that you should be done with the withdrawals and be on your way to being an ex smoker. I gave myself about a week extra to quit with that last pack, and it was so helpful.
By that time the morning sickness was kicking in pretty bad and I didnt really want to smoke because everything made me feel so sick. I was a little grateful to the morning sickness for that.
If you need to take a little bit of time to do it, don't feel bad. I knew I was pregnant as soon as I missed my period, so I still quit before a lot of women with irregular schedules would have known they were pregnant. Also, there was NO WAY I would have been able to smoke and deal with the looks you get if you smoke while pregnant. I knew it was bad for both me and the baby, and I did care, so I could never have been able to stand the guilt if people saw me smoking. I also munched on a lot of crackers which helped with both the smoking urges and the morning sickness.
You can totally do it if you try. Breaking the habit part of it is really important. The addiction part is gone in 3 days. So giving myself that extra pack to wean myself off them and get rid of my usual "ritual" cigarettes really helped. Good luck and Congratulations! Start taking those prenatals!