Period late by 30 days


So my period is late by 30 days. I took 2 tests a couple weeks ago then anther about a week ago that all said negative. I am starting to feel nauseous specifically in the morning and at night. It doesn’t feel like my period is coming anytime soon. It’s hard for me to know when I would have conceived because my period is irregular and I’m newer on here so my periods and ovulation isn’t quite predicted here yet. I will probably get another test this weekend. It’s just frustrating with irregular periods 🙄