Sayang, for headaches masa pregnant, better you see your doctor first okay, especially at 4 weeks, want to make sure everything aman-aman. Don't use minyak kapak or any oil without checking with them dulu, sebab ada ingredients yang tak sesuai for pregnancy. A few of my mum friends had headaches early pregnancy and the doctor gave them safe options, so definitely worth a quick call or visit! Jangan risau, most headaches okay je, but better safe than sorry kan.