Thanks for providing more information.
It is possible that the bleeding is coming from the cervix (the mouth of the cervix) and not from the uterus.
You could be suffering from a condition known as cervical erosion.
This is a condition which occurs in women in whom the estrogen levels are high, for example, in pregnant women or in women who have been on birth control pills or other hormonal contraceptives.
Other possible cause may include Ovarian cyst as you have history of complexed cyst causing pain and bleeding.
So any abnormal bleeding shouldn't be ignored and you need to be seen by your gynecologist for a clinical examination.
Further repeat ultrasound should be done to check size and growth of cyst.
Urinalysis should be done as well.
You can take OTC Motrin for pain relief.
And apply warm compresses with a heating pad on lower abdomen.
If pain is severe,it's good idea to visit ER.
Hope this helps.
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