Help, Please 😊

Elizabeth
Hi,
Not sure if I'm being compulsive...I've never been pregnant and my husband and I have never tried.  We had unprotected sex on Feb 14 while I was 9.9% fertile according to this application.  I did pee and clean myself after intercourse.  
Maybe I'm overthinking, but I feel bloated, tired, and lightheaded.  I'm supposed to get my period on March 4th.  Is it too early to feel symptoms a week later?  Is it too early to take a pregnancy test?Â