I just had my baby at 39 weeks. i just stopped using meth at 31 or 32 weeks, they sent the umbilical cord to get tested. will it show up?

That is a puzzling post. When I send out the cord/placenta it is to look for signs of germs/infection. I never use it to look for drug use. If you were using at 31-32 weeks, I could find evidence where I usually look.

If the cord is tested for Meth, it is likely to provide a positive result. Visit this technical article for information: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2782418/