Help! Pregnant sick son!

Olivia

15 weeks pregnant today and my son (3) woke up sick and got worse took him to the ER since it didn't break tonight. He came back positive for the flu and they are testing for strep but I'm so scared and nervous about me getting it next. How can I for the most part protect myself and make sure the baby is good. I've been stressed today with a pounding headache but making sure I'm eating and pushing fluids.