Aiyoh, rasa pahit dan masam tu very normal dalam early pregnancy lah, especially around your week ni, banyak mum friends ku complain pasal benda sama! Try sucking on lemon drops or ginger candy, minum banyak air putih, dan avoid makanan yang too heavy atau greasy sebab tu trigger the taste. But since you're wondering if this is normal or ada something else, best check with your doctor just to be sure everything okay, especially since you're a first-time mum dan want to be careful! Jangan stress sangat ye, usually it'll pass as pregnancy progresses.