Oh I totally understand how scary that can feel, especially as a first time mum when everything is so new and you are not sure what is normal. When I was pregnant with my first, I also had all sorts of strange pulling and tightening sensations around that stage and I would panic every single time. Since your gynae is on leave and you are already 30 weeks, I would really encourage you to call the clinic to speak to whoever is covering, or just head to KKH's 24-hour women's urgent care if the sensations feel more frequent or stronger, just to get checked and have peace of mind. It is always better to get it looked at by a doctor rather than wait and worry lah. Hang in there, you are doing great and it is really good that you are paying attention to how your body feels.