Oo, normal talaga yan sa second trimester kasi ang baby bump ay nakakaapekto sa posture mo, at ang ligaments mo ay nagiging mas relaxed dahil sa hormones, a few of us moms had to start using lumbar support pillows habang nagwork from home hehe. Pero if the pain is getting really intense or may ibang symptoms, mas mabuti pang i-check with your OB lang to be safe, kasi gusto mo sigurado na okay lang lahat.