Late on my period...but confused

Aisha • ✨👶🏽😽😁

So on the 10th of December was my ovulation, it’s been 16 dpo today. Im also late on my period which makes it 3-4 days late.

I’m sick in the morning but only after I eat, I have weird cramping right above my pelvic bone, my hips feel like the are getting pushed apart, my head is pounding, all I want to do is sleep but I can’t which is so annoying...oh last thing my nipples are so sensitive, just the nipple part not my whole boob!

I took a test yesterday but came up negative. Why is this happening if I’m not pregnant, or am I pregnant but it’s too early to tell?????