Ay, sakit sa tagiliran is so common sa pregnancy, lalo na around this time kasi lumalaki na talaga ang baby at uterus mo! A few of us moms experienced it, usually it's ligament pain or round ligament pain lang, which is normal pero nakakasakit talaga. Pero since it's on one side specifically, I'd really suggest checking with your OB para ma-rule out if it's something else, just to be safe. Paracetamol and rest usually help, pero mas better if doctor checks it out para mapakali ang mind mo.