Don't be upset. It's not good for you and the baby. I understand your feeling. I first told my parents when I was one month pregnant. Their reactions weren't a happy one either. They are more concern about if we have enough money to raise another kids and the house is too small .........etc. Of course you need to explain to them about how you feel and what's your plan.........They will understand. When time goes by and they see your tummy is getting bigger and bigger each day, they will be more than happy.
As for your health condition, try to drink more chicken soup and milk. Are you taking vitamins and folic acids?