Smoking Help.

So, I've been a heavy smoker for 5+ years, and a couple days ago I found out I was 7 weeks pregnant. Since then I've been able to cut down my habit from 3-4 packs daily to about 5 or so cigarettes a day. But, I'm having extreme difficulty giving up those last few cigarettes. I wanna know any tips you have, or stories about how you quit. I feel like I'm failing my child because I can't give them up. But, I know I NEED to, the cravings are just so ridiculously strong. So, any advice, tips or anything you know that could help, please comment. I plan on talking to my Doctor about it on July 5th. I'm 7 weeks and 4 days today. Thank you.