Hi Lily,Normally, the second stage of the implant procedure is either minimally invasive or completely noninvasive. In the typical scenario, the second stage process involves taking an impression of the fully healed implant. In some cases there is gum tissue that is covering the implant which will need to be removed so that the dentist can take an impression of the implant in order to fabricate the cap and the attachment piece which is called an abutment.In my practice, I would feel completely comfortable doing the second stage procedure on a patient during pregnancy assuming the patient was not having any major pregnancy complications. Hope this was helpfulDr Champagne