So I use two apps, Glow & Ovia. Today I'm 27 weeks and I was excited thinking I'd be in my third trimester today. Glow said it was last week which I know isn't right. And I thought ovia would say it was today but it still says 2nd trimester. I always swore and thought 27 weeks was the third trimester. So am I in my third and these apps are wrong? Or have I always been wrong?