Could it be even possible?

I'm 3 weeks dpo I had 2 days of light spotting. Nothing huge like normal period when period was due..it started late afternoon and was like nothing. I took a hpt..nothing. I got sick with what seemed to be a cold now here I am today so queezy I just want to lay in bed so I dont feel so horrible my head hurts and I'm having pelvic pressure I slept all day yesterday been tired all day today.. but I thought for sure I'd be out until I started ovulating again which should be in 2 days and had the tww to test again. Anybody have any advice?