My sense of smell heightened, 6 days after sex had pinkish brown disharge. still no period. sensitive nipples. mild lower back pain. restless nights.

Take pregnancy test: You have not really asked a question here, but i'm guessing that you may be concerned about possible pregnancy. If so, you can take a home pregnancy test once you've missed your menstrual period. It will be accurate a week after your missed period -- some are accurate sooner. Or, visit your doctor who can provide a serum test.