Aiyo normal je, don't worry! At 5 months, your uterus is growing quite fast so yang stretching sensation tu memang boleh terasa macam itu, a few of my mum friends also kena the same thing early on. Kali-kali rasa macam pulling or tightening, especially bila you move or change position, that's just your ligaments adjusting to accommodate baby growing. Just make sure you're not having any spotting, severe cramping, or persistent pain lah, kalau ada those signs, then better check with your doctor to be safe. Otherwise, rest assured you're doing fine!