Is my baby still alive in there😞

I'm 11 weeks+ So iv been thinking about miscarriage much less and my negative feelings went way down,iv seen my babies heartbeat at 8weeks however iv been stressing a lot lately, arguing with my husband due to my moods and stupidly turned to a cigarette(please don't judge me please) my symptoms are still quiet strong but iv been reading about symptoms being strong and baby could still stop growing,I'm so scared I dont know what to do...my next scan appointment is at 13 weeks and Im already sh*ting in my pants 😭