16 dpo, bfn this AM, pinkish watery cm

Paige

I am 16 dpo according to my calendar, three days late. I am thinking I ovulated late. Took a test this AM at 4AM and it was BFN. A couple hours ago I had a pinkish tinge cm and have had nothing since. My symptoms are exhaustion, headache earlier today, boobs aren’t super sore just feel weird and sensitive, stomach was upset earlier today. When should I test again? Any input?