Hay nako, headaches during pregnancy ay common talaga, lalo na first trimester dahil sa hormonal changes at blood volume increase, pero kung two days na at intense ang sakit mo especially pag bumababa ang ulo mo, better check with your OB agad para sure lang, a few of us moms had similar complaints at natuwa kami knowing it was just hormones, pero importante ma-rule out kung may ibang cause. Drink lots of water, get some rest, at kunin mo yung paracetamol kung kaya ng buntis mo, pero please see your doctor para ma-assess properly, bes!