I am abit worried can some one please help me?

Hi i am 38weeks pregnant now. but way before i knew i was pregnant i was smoking n drinkin... not alot but every now n then. I stoped when i found out i was pregnant which i was 6weeks in i have not touched a single cigerette nor alcohol after i found out... now i am worried that my baby might be harmed... Does anyone know weather i should worry or not?