Sayang, back pain and those crampy feelings boleh normal masa second trimester, tapi sebab ni first baby ko, memang lah jadi worried! A few of my mum friends experienced the same thing around that time, some kena because of posture changes, some sebab ligaments stretching. Tapi please check dengan doctor atau midwife ko, especially kalau the pain gets worse atau ada spotting, okay? Jangan takut to get it checked, better safe than sorry!