Aw congrats sa baby! Yun ang Braxton Hicks contractions, totally normal yan especially kapag gabi when you're tired, marami sa amin ang nakaranas niyan around 15 weeks onwards, and it just means your uterus is practicing para sa actual labor. Since nauubos ang tigas mo after a while and walang pain, baby's fine talaga, pero kung worried ka talaga or kung may spotting or cramping, best to mention it sa OB mo during your next checkup para peace of mind lang!