Pms or pregnant??

Sarah • 27. Married. My son was born 2/22/16 and his little sister 7/5/17
I had a sore throat for a few days and lots os sneezing for whatever reason. Then I recently started getting really itchy! Like all over my back and tops of my legs- but nothing is there! I'm thinking I'm coming down with something or maybe it's PMS (your immune system is down when your close to af time. Which sucks because I was really hoping I was pregnant 😩 even though I am still a week away, does anybody else get symptoms like this?