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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.
So, for instance, before ovulation vaginal discharge may be heavy for some women. During ovulation the discharge will still be clear, but it will have a stretchy consistency. Other factors such as stress and sexual excitement can increase the amount of discharge.