Thoughts?

I'm 28, stopped BC in November. Last period was 12/29-1/2. Glow estimated my ovulation was 1/12. We BD'ed 4 times during the fertile window. Both Glow and Ovia predicted I would start AF today but she didn't show. Today I was nauseous all day. Took a hpt yesterday and it was negative. When should I test again? Thanks!