Should I take another test? (Updated)

Alright ladies I am 15 days late on my period and I am feeling weird. Yes, I am sexually active and we are trying to conceive. The past few days I’ve been slightly cramping down south and having mild headaches. This morning I woke up with a massive headache, nausea and my dog whining (doggo is not a concerning factor in this situation) it’s been roughly 20 minutes since I woke up and I’m sitting next to the trash can because the nausea is that bad. I’ve been slightly gassy, having to pee every 30 minutes and I’ve got a horrible case of diarrhea that’s been going on for a few days (could be all the dairy I’ve been consuming) I took three digital tests last week and 2 of them messed up and the third said negative. I’m also considering stress to be a factor to this late period since I recently was switched from the night shift to the day shift at work but it was over a month ago. I need some guidance here ladies.

Update: not five minutes after I closed this app I threw up

Update 2: I just took one and it was negative. 😭 I wanna give up so bad