Growing evidence actually suggests that pregnant women who have gum disease may be more likely to have a baby that is born too early and too small. While more research is needed, it appears that gum disease triggers increased levels of biological fluids that can in some cases induce labour. Data also suggests that when gum disease worsens during pregnancy, there's a higher risk of having a premature baby.
Throughout this amazing time your body is changing to adapt and support the growth of your baby. It is during this period that with an increase of hormonal activity the pregnancy may cause an exaggerated response to dental plaque.