Smoking while pregnant 😩😩

Katie • Single mama to one beautiful little girl! She’s my whole world.
So I was smoking half a pack a day, and lightly ttc. But I just found out I was pregnant a couple days ago and haven't smoked in 48 hours. But I just lit a cigarette and I didn't even come close to finishing it, but I feel like such a failure. Have any of you had experience with quitting cold turkey? I'm withdrawing so hard today. I just need some advice :(