Hello dear Understand your concern. I think it may be due to extra pressor that produced during sneezing aggravate your bleeding. But you should consult the gynecologist It may be warning sign: Following are the causes of your problem: Vaginal or cervix infection Cervical poly Cervix insufficiency Molar pregnancy Placental bleeding Advice is below: Take proper rest Sleep in leg rise position Avoid strenuous activity Drink more fluids and take healthy diet Avoid tampon use You should consult the gynecologist immediately if: Abdominal pain, fever, chill, passing of more blood clots, passing of fluids from vagina And undergo pelvic examination and USG to confirm the above mentioned diagnosis and take proper treatment hope this may help you Best regards Dr. Sagar