Help! I’m so overwhelmed 😞

I missed my period by 3 days. Took a test last night and one this morning (12 hours apart) and they’re both indicating I’m pregnant. My husband is over the moon! I’m just a little overwhelmed. I’m not sure I’m ready to believe it because it’s so early! If I’m pregnant then it can’t be more than 3 weeks or so. Someone with experience help! What do I do now? Where do I start?

I just need to calm down.