Caffeine Intake

Hello po, I was an avid coffee drinker before when I was not pregnant pa po. Nakaka 3-4 cups a day ako before but since I got pregnant, I limited to 1 cup a day nalang. Ang struggle ko po is yung pananakit ng ulo ko due to reduced caffeine po. Pwede po bang mag 2 cups a day pero decaf na coffee? Nakakalimutan kong itanomg sa OB everytime I go in fpr chdck up po?. Salamat sa makakasagot po.