Late period but not sure when I ovulated?!

So my period is late, I think...2-3 days. My cycle is generally 28-30 days or so. I was under a lot of stress with some health stuff for our daughter when the app predicted I would ovulate. So not sure when/if I did. I really wasn’t tracking anything since we aren’t trying...but once everything cleared up, we went on vacation and didn’t use protection. Anyway, I tested Friday and got a negative. I’ve been feeling off, similar to how I felt with our first. Hot flashes and upset tummy today. So I’ll test again next week. So it’s either delayed/skipped period from stress or a vacation baby?? Anyone been in similar situations?