Hello Thank you for your query. It seems like you are suffering from rectal bleeding and dysentery which might lead to preterm labour. A single course of the medicines described would not any damage to your fetus. Also the spasmag can be taken for 2 weeks. please improve on your diet, and be careful about fetal growth, amniotic fluid levels and fetal nutrition by serial clinical examination and ultrasounds. Have bland , home cooked food and avoid outside eatables. Take regular antenatal supplements as prescribed. Take care.