Smoked at 16 weeks

So I am 16 weeks pregnant & I had stopped smoking when I found out I was pregnant at about 4 weeks & I got the craving really bad & Well I caved & I smoke a joint with my husband. & it was not good experience. I was very paranoid & I felt like I was going to pass out. Now I fear of the effects it may have caused on my baby. I am looking for words of advice, should I go to the doctors or not, or the experience you lovely momma have had with smoking & your little angels?