im 21 weeks pregnant and there is blood on my stool

im 21 weeks pregnant and anemia my doctor gave me medicine which i drink in the morning and in the evening but yesterday until today i noticed that there is blood on my stool its black, darker and contains blood. please need advice i cannot wait until april 3 my scheduled for hospital to know if im okey this is my email add ***** ill be waiting for your response thank you very much and god bless


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