Not giving up!!

My boyfriend n I have been 2gether 4 5 yrs now n recently we hav decided we wanted a baby. We hav always had unprotected sex n r now wondering why haven't I ever gotten pregnant in the 5 years of our relationship. Becuz believe me we hav had our mishaps, but still managed not 2 get pregnant. now my boyfriend n I r in good health. N we hav been trying 4 about three months now, n I have yet 2 have positive results. there r some times that I feel that I am but once I test, it is always a bfn.we r not going 2 give up but sometimes it does make us sad.