smoking and pregnant

I just found out I'm 13 weeks and I've been smoking for the last 13 weeks without knowing, I feel so shitty. Will my baby be alright? I read that the risk of SIDS is 3 times higher and I'm just freaking out. is everything going to be Okay? any personal stories where babies are born fine?? (I normally don't get my cycle every month due to horrible stress)