Preeclampsia doesn’t hit that early. I’m migraine prone and also had pre-e in a prior pregnancy. This pregnancy was particularly bad for headaches and Tylenol unfortunately doesn’t touch them. Hormonal changes can bring on more frequent headaches (in addition to cutting caffeine as mentioned above). The headaches leveled off for me around 20 ish weeks, the first trimester was rough with frequent and long headaches. My MFM said occasional use of Immitrex was fine but I only ended up using it once or twice when symptoms were particularly bad. The MFM also recommended a 400 mg / day magnesium supplement and that did seem to help reduce headache frequency. If you are cutting caffeine, I was advised 1-2 cups of coffee or 200-300mg caffeine a day is typically fine and the caffeine can help with headache.