Help! All advice welcome.

So my ovulation tests have pretty much all come back negative. Which made glow think my period was going to be on like a 42 day cycle. However I bled on June7th just a teensy bit, had sex two days before that and two days after.(I didn’t test on June 7th because you know blood) later realized that mmm that might have been the ovulation day.

Yesterday I took a pregnancy test from the dollar tree. Midday. Came back negative. BUT today massive nausea, headache , tired and… I’m now 3 days late from my normal 28 day cycle I have always had (outside of the crazy negative ovulation 42 day prediction) I have always been 28 days very very consistently.

Everytime I eat or drink anything I’m nauseated and when I don’t I’m nauseated.

So I’m here to ask how long should I hold my per after drinking roughly 10 ounces or less of water ? Should I hold it?

Tbh ovulation tracking is super duper new to me. I never used to bleed during ovulation either. So that’s also new. But my doctor has me taking high iron supplements with vitamin c; as I found out with my last miscarriage I’m anemic. So that’s mostly the only change.