Will DHS or CPS show up after sending me home, knowing we both tested positive for THC at birth?

I just recently had my 1st baby. I do not have any cases with DHS or CPS, and do not have a criminal record. I smoked while pregnant so I could eat, I couldn't keep anything down! My OBGYN was aware I was smoking during pregnancy, and never told me to quit, due to the terrible morning sickness. The hospital tested my babies urine, and a case worker from the hospital came in my room the day I was being discharged. She told me she has to report me to the state due to the results, and said they MIGHT come to the house. Long story short, will they show up, test us again? Will they show up and take him? Or will they even show up at all considering I've never been in trouble with the state at all, or for anything. I'm clean, other than my pee. I have a full time job, I PAY for our insurance, and don't depend on the state for anything. This Momma is over here freaking out! Please help me out. I don't wanna lose my baby over this, considering he's in a perfect environment. I can show you where the abused kids are at, and the poor kids that parents who are pill heads/meth heads.