How accurate is glow?

Hi there! I have used the glow app for 7 months now. It's working great for my periods. But I have never used it for my ovulation days. I have a very normal period so... I expect that after 7 months it would be accurate.  I really really want to conceive soon! If I conceived around Halloween that would be amazing! But still to early to find out..... I'm a little on the edge for sure! I really want this! And it would make the best birthday gift ever! (I am suppose to get my period on my birthday. Nov.15).