Had a nude humping session with my boyfriend without intercourse. periods late by a week.. pregnancy test shows negative. worried. ?

No sex, no baby: From this episode, without penetration the chances of pregnancy are extremely low. The chance is actually zero unless there was ejaculation followed by some form of penetrative contact such as by fingers , etc. Now, if you had intercourse a week prior or a few days after, that's a different story, but in short no, from what you describe I would not consider pregnancy to be possible.