Uy, totally normal yan sa pregnancy, mommy! A few of us had the same issue, hormones and the baby sitting on your intestines talaga ang culprit, kaya mas mabagal ang digestion. Just make sure you're drinking lots of water, eating fiber-rich foods like vegetables and fruits, and staying active kaya hindi ka mauubusan ng lasa, but since you're already at 21 weeks, better mention this sa OB mo during your next check-up para sure lang na okay ka at pwede ka rin i-recommend ng safe laxative or stool softener if needed na hindi makakasama sa baby.