Ay, totally normal yan sa pregnancy, lalo na pag lumalaki na ang baby! One of my mum friends had the same thing around that time, sabi niya parang ligament stretching lang. But since it's persistent, best to mention it sa OB mo next checkup para sure na okay lang, better safe than sorry, di ba? Kasi may iba't ibang reasons pwedeng maging tagiliran pain, some harmless lang talaga but doctor can rule out anything else quickly.