|It doesn't have a gestation period but it does cause a reaction to the body. The rash from poison ivy, oak, and sumac usually appears within 24 to 48 hours after contact with the plant. In some cases, though, the rash may not appear for a few days afterward. The worst stage of the rash usually occurs within a week of exposure. Depending on how severe it is, the rash may take 2 or 3 weeks to heal.
1. The period of development in the uterus from conception until birth; pregnancy.
2. The conception and development of a plan or an idea in the mind.