When to start timing contractions?🤔

Sara

FTM ALERT!! 38+5

I’ve been having mild period like cramps sometimes with super tightness on my belly. Now I don’t really know if these are contractions or not 🤷🏻‍♀️ and idk if I should start timing them. They don’t feel strong so I really don’t know 😫 help me please! Xx