Nausea and condoms

Im gonna try to keep this as short as possible:

I’ve been nauseous on and off for the past week but everyday..

We use condoms

My “Flo” app says period is due tomorrow

“Glow” says it’s due Friday.

Last month my period was wonky, much lighter than usual and early but around day 2-3 turned red color and went on for 5 days like normal but was just much lighter.

I tested twice even though I was bleeding which was technically before my projected period and then tested again the day my period was actually supposed to start and all negative so I just let it go and hoping that my period is just getting lighter

I’ve been cramping all month but more like pelvic pain (I get this frequently) but this month it as been worse since ovulation

I’ve had sex multiple times around fertile period but always with a condom (im not on birth control)

Is there a chance I could be pregnant even if we use condoms?

When should I test since my apps say different things? I don’t want to waste a test if it’s too early