Most times when my boyfriend and i are intimate he ejaculates inside of me but i've never gotten pregnant. is it bad timing or am i just not fertile?

See below: 10% (roughly) of normal, fertile couples will not conceive after a year of well-timed intercourse intending to get pregnant. It's not going to happen every time. Try timing your ovulation and having sex daily around that time. If you haven't gotten pregnant after 6-12 months, you may want to see your gyn and have your boyfriend see his urologist to see if either of you have infertility issues.