Oo normal yan, mama! Those are likely Braxton Hicks contractions na nagsisimula na around this time, especially if you're active or dehydrated, a few of us felt the same thing around 19-20 weeks kaya don't worry. Just make sure you're drinking plenty of water, resting when you can, at kung patuloy or mas madalas na siya between now and your July 25 check-up, mention it agad sa OB mo para ma-assure ka properly.