TTC Journey

I'm on my ttc journey vycle #2 . Tracked my period for the past 3 months or so. I'm currently 7 days late, but when i tested on day 4 i was late, HPT is negative. I don't feel any symptoms apart from fatigue and mild headaches and slightly brown tint discharge on day 5 and 6. Has anone encountered this before? What should i do?