Should I test ? Maybe TMI

Not sure how many DPO I am . But about 6 days ago I got a TERRIBLE headache I felt like I was going to puke everywhere . I was tired all day that day too . I've been constipated for about 3 days now . Last night I was peeing every 20 mins & the same again today . Light cramps , nothing painful , but noticeable . No tender breasts , no puking . Increased appetite . Increased watery discharge  . But no implantation bleeding .  I have a 37 day cycle , & I'm on CD 27 . Too early ? Or should I buy a test asap ? I don't want to get too excited ?