Yes, severe headaches may occur as a common side effect of Etosys Tablet (Tranexamic acid and Etamsylate). You should not change or reduce the dose on your own, as it has been prescribed to help control bleeding from the subchorionic haemorrhage (a collection of blood between the womb wall and the outer membrane surrounding the pregnancy). Please inform your doctor or obstetrician, as they may adjust the treatment or suggest safer alternatives based on your scan and symptoms. In the meantime, ensure good hydration, and you may use paracetamol for headache relief if advised by your doctor.