Ay, ang left side pain during second trimester puwedeng normal talaga, especially pag tumatagal ang pregnancy kasi lumalaki ang baby at umaayos ang lahat ng organs mo! A few of us moms experienced yan rin, lalo na pag nag-shift kami ng position habang natutulog, pero better mag-check pa rin with your OB just to be safe, pwedeng ligament pain lang or round ligament stretching, pero important sure na okay lang talaga based sa baby's position at lahat.