6 days late + nausea but 2 negative tests

Erin

I'm 6 days late for my af and I'm usually spot on or 1 day either way. I've done 2 tests, 1 at 4 days late and one first thing today. I've been feeling really sick last 2 days too. with my first boy I know I ovulated a week later than I thought. is there any way I could still get a bfp? really confused as to why I haven't had af otherwise.