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2 doctors agreed: Hard to say: Lifting the heavy object did not cause your vaginal bleeding. You may have have just seen it come out because of the abdominal pressure you exerted during the lift. The cause of the vaginsl bleeding could be start if your period, abnormal uterine bleeding, laceration , etc . The reasons are numerous.
C-section delivery may cause heavy bleeding in the first few days (5). It may be due to incisions during the surgery and uterine wall repair. Do not use tampons for six weeks as they increase the risk of infection in the uterus and vagina. Though the flow is heavy, you should constantly check it.