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Bleeding/spotting during or after intercourse could be suggestive of could be suggestive of vaginal infections like Chlamydia, Gonorrhea, Trichomonas, vaginitis, cervical erosion, cervical dysplasia, hormonal disturbances due to use of contraceptive pills, presence of uterine or cervical polyps, uterine fibroids, ovarian cysts, endometrial polyps, endometritis, adenomyosis, etc. The change in smell could also be suggestive of infective causes. You should consider visiting your gynecologist for examination and vaginal swab/smear culture sensitivity test, PAP smear test and ultrasound scan to look for the exact cause for the bleeding. Get your partner also treated simultaneously to prevent chances of re-infection. Drink plenty of water. Be regular with birth control use. If you miss 2 or more than 2 active pills, you will no longer be protected (if you have unprotected intercourse anytime during that cycle). If you suspect to be pregnant, request your doctor to have a serum/blood HCG test done to confirm/rule out pregnancy accurately.
Take care.