21st Birthday, Help!

Mackenzie

My 21st birthday is coming up on the 20th of this month and my sisters are going to expect me to celebrate but obviously I can’t and I don’t want to tell anyone I’m pregnant until the second trimester. I honestly have no idea what to tell them. I was hoping someone could give me some ideas. I’m only 4 weeks 4 days so hopefully I can come up with a really good excuse that’ll last for two more months