5days late

So I took a test on day 2 negative also on day 3 also negative I’ve never been this late ever an got a negative test still no symptoms of af coming at all no cramps back pain nothing no spotting or anything but I keep having negative tests I’m wondering if I should go to the dr at this point bc I’ve missed my whole period so maybe I need a blood test or something anyone else have a similar situation I have 4 kids two singles an a set of twins each one I’ve took test cheap ones and clear blue an found out I was pregnant this has me so confused I’m 35 btw any suggestions are welcomed