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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.
It's usually white or clear. A lot of things can cause vaginal bleeding. It is often on oncoming period, a scratch from a fingernail, or a rip from not being lubricated enough during sex. I have never heard of heavy lifting causing vaginal bleeding. You need to talk to your ob-gyn though. Only she can tell you if something is wrong or not.