Ob-Gyn questions? Ask a gynecologist online.
it´s normal to see the blood inside your uterus during menstruation. Free liquid generally is no problem there, but maybe it has been a cyst, or an inflammation. Then I would recommend an ultrasound control after the next period, further treatment then depends on the result.
Dr. N. Scheufele
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if it´s free liquid it could be due to a bursted cyst and should leave without problems. So it´s no serious reason to worry, just await the further control.
I mean if it´s free floating liquid like menstrual blood and not infolded by a cyst.