My 14 year old step daughter has sex?

my step daughter has regularly daily sex since a year she is almost 15 now . i am not sure if i should say something , my husband said its not unusual nowadays and as long as she is open with us about it its ok and we can manage , indeed she is very open about it and talks to me about it , we even went to get her checked by the doctor. i can't say its a real problem she is very mature for her age and advanced in her body and she takes anti baby pills since a year . maybe i am worried to much .