To early to test?

Myself and my SO decided this month so start ttc my period was due Monday but no signs of it yet. 
I have been feeling a bit lousy lately too some days I'm off my food, feel nauseated, fatigue, lower back pain, sore boobs, I'm thirsty a lot more often now and have frequent urination. I am full of cold so not sure if that will have anything to do with it. 
Is it too early to test? I don't wanna get my hopes up!

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