Hello everyone! 38 weeks. 5 days of contractions so far, but the baby …

Hello everyone! 38 weeks. 5 days of contractions so far, but the baby is often moving in the evening. Due date May 12th. I'm worried if my body is preparing for labor or not?... I stopped taking calcium and ferrous tablets. Taking only Thrombo Acs. Nothing else. Will it help me do some light exercise with fitness from week 39? Or is it too early? What should I do...??