Aiyoh sayang, pelvic pain in pregnancy is super common, especially around your weeks, a few of us went through it and it's usually just your body preparing for delivery, ligaments stretching and all that. The Braxton Hicks (those tightening feelings) can come and go too, nothing to panic about, but since you're a first-time mum and it's worrying you, best to mention it to your gynae at your next checkup just to be safe and get peace of mind, okay?