Can I be pregnant?

I am 27 years old and I am ttc!! I had my last period on feb 9 and me and my partner had sex on the 16th and 22nd and the 2nd!!! I have been very nauseous but I have also been having lower back pain!!! I don't know if it's pre-menstrual or could I be pregnant!! My next cycle is in 5 days is it too early for me to test?