Ay, alam ko yan, sobrang common sa pregnancy, lalo na kapag 23 weeks na kasi lumalaki na talaga ang baby at nagbabago ang posture mo! A few of my mum friends complained ng same thing, especially on one side lang like you. That said, mas safe na i-check mo with your OB para sure lang, especially kung it's sharp pain or swelling na lumalaki, kasi minsan it can be ligament pain or just pressure pero better to rule out other things.