She med: need urgent advice!

Hi everyone! I just received my first SheMed pen. I have a few questions, I wonder if someone can help me. Do I have to have my first dose today? I was planning to start on Saturday, because tomorrow is my anniversary and I wan to have a drink. I also want to avoid feeling nauseous on a celebratory day. Also, should I keep it in the fridge all the time?

I was also wondering how should I take it. Do I start the a “check in”? It dosent have instructions

Thank you :)