Ay, hindi ka lang, mama! A few of us pregnant moms have complained about knee pain din, especially around second trimester when everything's getting heavier. It's usually normal because of the weight gain and hormones na nag-loosen ng joints, pero para sure lang, better to mention it sa OB mo sa next checkup para ma-rule out kung may ibang dahilan. In the meantime, try to rest your legs pag kaya, avoid standing too long, at maybe try warm compress kung sobrang sakit, hopefully makakabawi ka ng konti!