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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 An intrauterine device (IUD) also may increase your chances of spotting or heavy periods. For more information on the IUD, see the topic Birth Control.  Infection of the pelvic organs (vagina, cervix, uterus, fallopian tubes, or ovaries) may cause vaginal bleeding, especially after intercourse or douching. Sexually transmitted infections (STIs) are often the cause of infections. For more information, see the topic Sexually Transmitted Infections.