Now that i know im not pregnant, i have a strong craving for weed and alcohol again?

even though it was unplanned i was almost sure i was pregnant so the feeling to use alcohol and weed went away. i was having some trouble staying away from it and i've only been off weed for a month and alcohol for like two weeks. i know that i don't have to worry about a baby now so im not worried about hurting it so all i want to do is get stoned or drunk. what do i do? i was trying to quit but after finding out im not pregnant i want to do it again! please help me...