Im 27 Weeks Pregnant, Quit When I Was 5 Weeks

Im 27 weeks pregnant, quit when i was 5 weeks pregnant, smoked again from 15- 20 weeks(2-3 hits a day), quit then smoked just for past 4 days, will my baby system be clean for thc before im due in 100 days. I passed a dr urine test last week. He is measuring above growth rate, and healthy bodily functions according to U.Sounds. just wondering if i completely stop now if ill be fine. Been smoking 12 years, been dependent on it. Please and thank you