5 days late, 17 dpo, negative test

For the last week or so I’ve been lightheaded, dizzy, nauseous, horrible headaches, and what feels like back labor that also makes my legs hurt . ( I had back labor with both my pregnancies) I’ve taken 4 test since 11 dpo till now and they’ve all been negative. I’m just so confused as to what’s going on. I will my calling my ob tomorrow but just was curious if anyone else has experienced this.

With both my pregnancies I had that gut feeling I was pregnant and had very positive test 5 days before my missed period. I don’t have that gut feeling this go round ( I know you can’t always trust your gut with this)