Constipation Relief!!

I am only 5 weeks along and havent had a proper bm in over 5 days! I am so backed up I feel nauseous and extra irritable! I eat a lot of fruits and veggies already, tried eating cheerios because I heard some people swear by them, and drank a hot tea and extra water. Still nothing seems to help. My system is so backed up I cant stomach anymore food without wanting to hurl! Please help!! This is my first pregnancy and I fear it is going to get lots worse..