Hay oo, totally normal yan sis, especially around 20 weeks kasi lumalaki na talaga ang baby at nagstretch ang ligaments mo, a few of us moms felt the same thing, parang sharp or pulling sensation sa groin area. Usually it's ligament pain lang, pero since you're asking and it's worrying you, mas maganda i-mention mo sa OB mo next check-up para sure lang at ma-rule out any concerns.