Hello, thanks for your question. We are really glad you talked to your doctor about this . Communication is key and your doctor is now aware and sounds understanding. Marijauna will stay in the system for varying amounts of time so there is more of a range than an exact nuber. Up to 30 days by some sources and up to 90 by others. But the up to 90 days is with hair sampling. 30 days is the more accurate reference number for blood, urine or saliva testing. https://www.healthline.com/health/how-long-does-weed-stay-in-your-system#detection-time-by-drug-test Try not to worry. It also can wash out sooner than that. If your doctor is aware, that is very helpful. Let us know how it goes and congratulations on your pregnancy.