the likely hood of becoming pregnant

does anyone know how acurate glow is? i had unprotected sex on the 23rd of jan(11th day of 28 day cycle) and i had sharp ovulation pain yesterday(jan.25) and was gone today(jan.26) basal temp also spiked up a little yesterday.jan 25(97.2)and a lot more today jan.26(97.6) im just trying to figure put if i may have ovulated earlier. glow says ovulation is the 27th of january(basal temp is 97.8 today jan 27). i would like to know how high or low the chances of me falling pregnant is. thank you