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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 Chronic constipation, prolonged diarrhea, straining and anal intercourse can all cause anal fissures.  When rectal bleeding is painless and develops after heavy lifting, a long car trip, pregnancy or constipation, it usually means internal hemorrhoids. Anything that places continual pressure on veins in the anus can engorge them. Over time, they can get bigger and bigger.