This is the hardest part of the plan. Though you have prepared what you'll say and have anticipated their reaction, and though you have picked the best time to have the conversation, this will still be one of the toughest conversations of your life.   Relax. Chances are that you've already played out the conversation in your head a thousand times. But what you need to realize is that you're predicting, most likely, is the Worst Case Scenario. Stop. You are 100 times more likely to get a better reaction from your parents than the ones you might be expecting. Relaxing will only make things easier.  Make your parents feel comfortable. Though it's unlikely that you'll have small talk for a while, you can smile, ask them how they are, and reassure them with a pat on the hand before you tell them the news. Say, "I have something very difficult to tell you. I'm pregnant." Say it firmly and with as much strength as possible.  Maintain eye contact and open body language. Look as approachable as you can when you tell them the news.  Tell them how you're feeling. It's likely that they will be so shocked that they won't react right away. Tell them how you're feeling about the pregnancy. Remind them that this has been very tough for you. Now that you've told them your news, they will have a strong reaction. Whether they are angry, emotional, confused, hurt, or full of questions, they will need some time for the news to sink in. Take it slow and listen to their side of the story without interrupting.  Reassure them. Though they are the adults, they have just received some big news, and you should try to stay strong for them.  Answer their questions. If you're prepared, then you should be able to answer their questions as honestly and calmly as possible. Ask them how they feel. If they are shocked into silence, give them some time to gather their thoughts, and then ask them how they are feeling. If they won't share their feelings after you shared yours, it won't be easy to move the conversation forward. Don't get angry if...

How would you rephrase that briefly using Chinese?
把你的消息告诉他们。 花时间聆听他们。 讨论下一步计划。