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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.
1 doctor agreed: Not likely: In general lifting objects does not cause problems for pregnancy but obviously if something is too heavy for you or makes you uncomfortable then it should be avoided. ...Read more.