Congrats on your first pregnancy! Headaches in early pregnancy tu memang boleh jadi normal sebab hormonal changes, tapi kalau sakit sangat and ada demam naik turun, better check with your doctor kat next appointment atau call clinic dulu sebab kena make sure semua okay. A few of my mum friends had similar concerns in first trimester and most turned out fine, but each pregnancy different so don't risk it, your doctor boleh advise what's safe to take and rule out anything else yang perlu attention. Jangan tahan sakit sangat, ada options yang safe for baby so just get checked out ye!