The teen pregnancy rate is at a record low in many states, but especially in Connecticut. Connecticut was ranked 50th in 2015 for teen birth rates, age 15 to 19, reports the U.S. Department of Health & Human Services. Pregnancy rates for teens have been declining for decades, and have gone down 75 percent from 1991 to 2015. Recently, from 2014 to 2015, the teen pregnancy rate dropped 13 percent. The cause of this sharp decline in teen birth rates could be attributed to a number of things.