In an earlier post you asked if your boyfriend could get into trouble. In most states, he could be jailed for statutory rape or child molestation because he is legally an adult and you were under the age of sixteen at the time of conception. But that is no longer the case in Indiana according to this news story I located:
The defense can be asserted if the person accused of having sexual contact with a 14- or 15-year-old is under 21, is no more than four years older than the alleged victim and was involved in a dating relationship with the victim at the time.
Sex with a person under 14 is still considered child molesting, regardless of the age of the perpetrator. But the new law could protect an 18-year-old from adult felony charges if he has sex with a 15-year-old girlfriend, for instance.