Super annoyed with the estimator

I have 34 day long cycles. I have a very long luteal phase and ovulate on cd15. I've tracked, rested and had it confirmed with a transvaginal ultrasound. If I put in that I tested positive on cd14 glow changes my cycle length to 28 days! I can guarantee that I will not have AF till cd 34. So when looking at when I can test, glow makes it frustrating for me to know when to test. :/