Eto po nabasa ko Mild stomach pain in early pregnancy (during the first 12 weeks) is usually caused by your womb expanding, the ligaments stretching as your bump grows, hormones constipation or trapped wind. It may sometimes feel like a ‘stitch’ or mild period pain. It’s is probably nothing to worry about if the pain is mild and goes away when you change position, have a rest, do a poo or pass wind.