Ang paninigas ng tiyan sa 25 weeks ay madalas na Braxton-Hicks contractions lang, na normal talaga sa pregnancy stage na yan, parang practice contractions ng katawan mo! A few of us felt it around that time din, kaya hindi ka nag-iisa, pero better safe than sorry, check with your OB lang para ma-confirm na lahat okay, especially kung may cramping or bleeding kasama nito.