Ay ganyan talaga sa pregnancy, sis! A few of us tried increasing our calcium and magnesium, like drinking more milk, eating bananas, and staying hydrated kasi dami naming binabasa na dehydration is a big trigger. Try din stretching gently before bed and doing light walks, honestly nakatulong din sa amin yun. But since you're already 28 weeks and concerned, best to mention it sa OB mo next check-up para sure na okay lang and walang ibang cause, better safe na!