Hi mama! Oo, normal yan, ang Braxton Hicks contractions (practice contractions) ay nagsisimula na around second trimester, kaya ang tigas ng puson mo ay likely yan, lalo na kung wala kang pain or bleeding at mawawala lang after a few minutes. But since pregnancy varies talaga sa bawat mama, mas safe kung i-mention mo rin yan sa OB mo during your next check-up, para ma-confirm na lahat ay normal sa iyo at baby. Rest assured, marami tayong nagexperience nito, kaya you're not alone!