I had unprotected sex he put it in me 3 times in the beginning.my period is late and i have back pain.i also have white discharged.what does this mean?

Unprotected sex: Do home pregnancy test. If negative, repeat in 7-10 days. White discharge may be yeast overgrowth ("infection"). See ob/gyn to be checked for std like chlamydia. If pregnant, start pre-natal vitamins right away to insure fetus' proper development. If yeast or std, make sure partner is treated, too.

Get a pregnancy test: If your late and had unprotected sex, get a pregnacy test.