Eh, honestly bunyi pop sekali je usually okay je, especially kalau tak ada pain or bleeding lepas tu! A few of my mum friends pernah kena gaing sounds macam tu during pregnancy, boleh jadi ligament stretching or just normal gas movements. But since you're only 7 weeks and this is your first time, better check with your gynae just to be safe and get peace of mind, okay? Takpa la, doctor akan confirm everything is fine!