No period but negative test

Noleen • Married summer 2015

I have had regular 28 day periods my whole life and with every pregnancy I e had I ovulated early and always tested positive around 10/11DPO. Last month my period was 24 days and the same the previous month. I am now on CD30 and still no period but negative tests. I’m almost 38 and wondering if it’s possibly my age affecting my cycles? Anyone else experience anything similar and what was the outcome?