5 days last hpt says negative

My af is 5 days late, my hpt says negative! When should I go see my dr?!?! I have never skipped my af and my cycles are very regular 31-32 days. We are ttc and I used and ovulation kit this month. We bd on my days leading up to my peak fertility and the peak days. I am extremely tired and my boobs are sore and tingly. I feel pregnant but the test says negative!! 😬 Has any one else had this happen to them? When should I go see my dr?