Hey mama, ligament pain (round ligament pain) is super common sa pregnancy, lalo na around 5 months when your belly's really growing! But since this is your first time and the pain comes and goes suddenly, it's best to check with your OB just to be safe and get her peace of mind, some sharp pains can be normal stretching, pero better to confirm with your doctor na lang so you're not worried the whole pregnancy, kaya go na po sa check-up mo!